Calculus
Calculus is one of the most important branches of mathematics, that deals with continuous change. Calculus is also referred to as infinitesimal calculus or “the calculus of infinitesimals”. Infinitesimal numbers are the quantities that have value nearly equal to zero, but not exactly zero. Generally, classical calculus is the study of continuous change of functions. The two major concepts that calculus is based on are derivatives and integrals.
The derivative of a function is the measure of the rate of change of a function, while integral is the measure of the area under the curve of the function. The derivative gives the explanation of the function at a specific point whereas the integral accumulates the discrete values of a function over a range of values.
1.  Introduction to Calculus 
2.  Calculus Topics 
3.  Functions 
4.  Differential Calculus 
5.  Integral Calculus 
6.  Applications of Calculus 
Introduction to Calculus
Calculus focuses on some important topics covered in math such as differentiation, integration, limits, functions, and so on. Calculus, a branch of mathematics, deals with the study of the rate of change, was developed by Newton and Leibniz.
Calculus Definition: Calculus in Mathematics is generally used in mathematical models to obtain optimal solutions and thus helps in understanding the changes between the values related by a function. Calculus is broadly classified into two different sections:
 Differential Calculus
 Integral Calculus
Both differential and integral calculus serve as a foundation for the higher branch of Mathematics known as “Analysis”, dealing with the impact of a slight change in dependent variable, as it leads to zero, on the function.
Calculus Topics
Given below is the list of topics that are closely connected to calculus. These topics will also give you a glimpse of how such concepts are covered in Cuemath.
Functions
Functions represent the relationship between two variables, which are the independent variable and the dependent variable. Let’s consider the following diagram.
There is an INPUT, a black box, and an OUTPUT. For example, suppose we want to make a pizza. We would need the following basic ingredients.
 Pizza Base
 Pizza Sauce
 Cheese
 Seasoning
The above reallife example can be represented in the form of a function as explained below,
The taste of our pizza depends on the quality of the ingredients. Let’s take another example
Suppose that: y = x^{2}
Value of x  Value of y 
1  1 
2  4 
9  81 
11  121 
Using the diagram given above, we get:
We can see that the value of y depends on the value of x. We can conclude that
 INPUT is independent of the OUTPUT
 OUTPUT depends on the INPUT
 Black Box is responsible for the transformation of the INPUT to the OUTPUT
In calculus,
 INPUT is an independent variable
 OUTPUT is a dependent variable
 Black Box is a function
Differential Calculus
Differential calculus focuses on solving the problems of finding the rate of change of a function with respect to the other variables. To find the optimal solution, derivatives are used to calculate the maxima and minima values of a function. Differential helps in the study of the limit of a quotient, dealing with variables such as x and y, functions f(x), and the corresponding changes in the variables x and y. The notations dy and dx are known as differentials. The process used to find the derivatives is called differentiation. The derivative of a function, y with respect to variable x, is represented by dy/dx or f’(x).
Limits
Limit helps in calculating the degree of closeness to any value or the approaching term. A limit is normally expressed using the limit formula as,
lim_{x→c}f(x) = A
This expression is read as “the limit of f of x as x approaches c equals A”.
Derivatives
Derivatives represent the instantaneous rate of change of a quantity with respect to the other. The derivative of a function is represented as:
lim_{x→h}[f(x + h) − f(x)]/h = A
Continuity
A function f(x) is said to be continuous at a particular point x = a, if the following three conditions are satisfied –
 f(a) is defined
 lim_{x→a}f(x) exists
 lim_{x→a− }f(x) = lim_{x→a+ }f(x) = f(a)
Continuity and Differentiability
A function is always continuous if it is differentiable at any point, whereas the viceversa for this condition is not always true.
Integral Calculus
Integral calculus is the study of integrals and the properties associated to them. It is helpful in:
 calculating f from f’ (i.e. from its derivative). If a function, say f is differentiable in any given interval, then f’ is defined in that interval.
 calculating the area under a curve for any function.
Integration
Integration is the reciprocal of differentiation. As differentiation can be understood as dividing a part into many small parts, integration can be said as a collection of small parts in order to form a whole. It is generally used for calculating areas.
Definite Integral
A definite integral has a specific boundary or limit for calculation of the function. The upper and lower limits of the independent variable of a function are specified. A definite integral is given mathematically as,
∫_{a}^{b} f(x).dx = F(x)
Indefinite Integral
An indefinite integral does not have a specific boundary, i.e. no upper and lower limit is defined. Thus the integration value is always accompanied by a constant value (C). It is denoted as:
∫ f(x).dx = F(x) + C
Applications of Calculus
Calculus is a very important branch, mathematical model that helps in:
 Analyzing a system to find an optimal solution to predict the future of any given condition for a function.
 Concepts of calculus play a major role in real life, either it is related to solve the area of complicated shapes, evaluating survey data, safety of vehicles, business planning, credit card payment records, or finding the changing conditions of a system affect us, etc.
 Calculus is a language of economists, biologists, architects, medical experts, statisticians. For example, Architects and engineers use different concepts of calculus in determining the size and shape of the construction structures.
 Calculus is used in modelling concepts like birth and death rates, radioactive decay, reaction rates, heat and light, motion, electricity, etc.
Solved Examples on Calculus

Example 1: Let f(y) = y^{2} and g(y) = e^{y}. Use the chain rule to calculate h′(y) where h(y) = f(g(y)).
Solution:
Given, f(y) = y^{2} and g(y) = e^{y}. First derivative above functions are f'(y) = 2y and g'(y) = e^{y}
To find: h′(y)
Now, h(y) = f(g(y))
h'(y) = f'(g(y))g'(y)
h'(y) = f'(e^{y})e^{y}By substituting the values.
h'(y) = 2e^{y} × e^{y}
or h'(y) = 2e^{2y} 
Example 2: y is a function of x, and the function definition is given as: y = f(x) = 1/(1 + x^{2}). Find the output values of the function for x = 0, x = −1, and x = √2.
Solution:
We have:
f(0) = 1/[1 + (0)^{2}]^{ }= 1/1 = 1
f(−1) = 1/[1 + (−1)^{2}] = 1/2
f(√2) = 1/[1 + (√2)^{2}] = 1/3
FAQs on Calculus
What is Calculus?
Calculus is one of the most important branches of mathematics, that deals with continuous change. Calculus is also referred to as infinitesimal calculus or “the calculus of infinitesimals”. Infinitesimal numbers are the quantities that have value nearly equal to zero, but not exactly zero.
What is Differential Calculus?
Differential calculus focuses on solving the problems of finding the rate of change of a function with respect to the other variables. The derivative of a function, y with respect to variable x, is represented by dy/dx or f’(x).
What do you Use Calculus for in Real Life?
Concepts of calculus play a major role in real life, either it is related to solve the area of complicated shapes, evaluating survey data, the safety of vehicles, business planning, credit card payment records, or finding the changing conditions of a system that affect us, etc. Calculus is a language of economists, biologists, architects, medical experts, statisticians. For example, architects and engineers use different concepts of calculus in determining the size and shape of the construction structures.
How to Find the Maxima and Minima of a Function?
To find the optimal solution, derivatives are used to calculate the maxima and minima values of a function. Maxima and minima are the highest and lowest points of a function respectively, which could be determined by finding the derivative of the function.
What is Integral Calculus?
Integral calculus is the study of integrals and the properties associated with them. It is helpful in calculating f from f’ (i.e. from its derivative). If a function, say f is differentiable in any given interval, then f’ is defined in that interval. It enables us to calculate the area under a curve for any function.