Sin 5pi/12
The value of sin 5pi/12 is 0.9659258. . .. Sin 5pi/12 radians in degrees is written as sin ((5π/12) × 180°/π), i.e., sin (75°). In this article, we will discuss the methods to find the value of sin 5pi/12 with examples.
 Sin 5pi/12: (√6 + √2)/4
 Sin 5pi/12 in decimal: 0.9659258. . .
 Sin (5pi/12): 0.9659258. . . or (√6 + √2)/4
 Sin 5pi/12 in degrees: sin (75°)
What is the Value of Sin 5pi/12?
The value of sin 5pi/12 in decimal is 0.965925826. . .. Sin 5pi/12 can also be expressed using the equivalent of the given angle (5pi/12) in degrees (75°).
We know, using radian to degree conversion, θ in degrees = θ in radians × (180°/pi)
⇒ 5pi/12 radians = 5pi/12 × (180°/pi) = 75° or 75 degrees
∴ sin 5pi/12 = sin 5π/12 = sin(75°) = (√6 + √2)/4 or 0.9659258. . .
Explanation:
For sin 5pi/12, the angle 5pi/12 lies between 0 and pi/2 (First Quadrant). Since sine function is positive in the first quadrant, thus sin 5pi/12 value = (√6 + √2)/4 or 0.9659258. . .
Since the sine function is a periodic function, we can represent sin 5pi/12 as, sin 5pi/12 = sin(5pi/12 + n × 2pi), n ∈ Z.
⇒ sin 5pi/12 = sin 29pi/12 = sin 53pi/12 , and so on.
Note: Since, sine is an odd function, the value of sin(5pi/12) = sin(5pi/12).
Methods to Find Value of Sin 5pi/12
The sine function is positive in the 1st quadrant. The value of sin 5pi/12 is given as 0.96592. . .. We can find the value of sin 5pi/12 by:
 Using Trigonometric Functions
 Using Unit Circle
Sin 5pi/12 in Terms of Trigonometric Functions
Using trigonometry formulas, we can represent the sin 5pi/12 as:
 ± √(1cos²(5pi/12))
 ± tan(5pi/12)/√(1 + tan²(5pi/12))
 ± 1/√(1 + cot²(5pi/12))
 ± √(sec²(5pi/12)  1)/sec(5pi/12)
 1/cosec(5pi/12)
Note: Since 5pi/12 lies in the 1st Quadrant, the final value of sin 5pi/12 will be positive.
We can use trigonometric identities to represent sin 5pi/12 as,
 sin(pi  5pi/12) = sin 7pi/12
 sin(pi + 5pi/12) = sin 17pi/12
 cos(pi/2  5pi/12) = cos pi/12
 cos(pi/2 + 5pi/12) = cos 11pi/12
Sin 5pi/12 Using Unit Circle
To find the value of sin 5π/12 using the unit circle:
 Rotate ‘r’ anticlockwise to form 5pi/12 angle with the positive xaxis.
 The sin of 5pi/12 equals the ycoordinate(0.9659) of the point of intersection (0.2588, 0.9659) of unit circle and r.
Hence the value of sin 5pi/12 = y = 0.9659 (approx)
☛ Also Check:
Examples Using Sin 5pi/12

Example 1: Find the value of 2 × (sin(5pi/24) cos(5pi/24)). [Hint: Use sin 5pi/12 = 0.9659]
Solution:
Using the sin 2a formula,
2 sin(5pi/24) cos(5pi/24) = sin(2 × 5pi/24) = sin 5pi/12
∵ sin 5pi/12 = 0.9659
⇒ 2 × (sin(5pi/24) cos(5pi/24)) = 0.9659 
Example 2: Simplify: 4 (sin(5pi/12)/sin(29pi/12))
Solution:
We know sin 5pi/12 = sin 29pi/12
⇒ 4 sin(5pi/12)/sin(29pi/12) = 4(sin(5pi/12)/sin(5pi/12))
= 4(1) = 4 
Example 3: Using the value of sin 5pi/12, solve: (1cos²(5pi/12)).
Solution:
We know, (1cos²(5pi/12)) = (sin²(5pi/12)) = 0.933
⇒ (1cos²(5pi/12)) = 0.933
FAQs on Sin 5pi/12
What is Sin 5pi/12?
Sin 5pi/12 is the value of sine trigonometric function for an angle equal to 5pi/12 radians. The value of sin 5pi/12 is (√6 + √2)/4 or 0.9659 (approx).
How to Find Sin 5pi/12 in Terms of Other Trigonometric Functions?
Using trigonometry formula, the value of sin 5π/12 can be given in terms of other trigonometric functions as:
 ± √(1cos²(5pi/12))
 ± tan(5pi/12)/√(1 + tan²(5pi/12))
 ± 1/√(1 + cot²(5pi/12))
 ± √(sec²(5pi/12)  1)/sec(5pi/12)
 1/cosec(5pi/12)
☛ Also check: trigonometry table
How to Find the Value of Sin 5pi/12?
The value of sin 5pi/12 can be calculated by constructing an angle of 5π/12 radians with the xaxis, and then finding the coordinates of the corresponding point (0.2588, 0.9659) on the unit circle. The value of sin 5pi/12 is equal to the ycoordinate (0.9659). ∴ sin 5pi/12 = 0.9659.
What is the Value of Sin 5pi/12 in Terms of Sec 5pi/12?
Since the sine function can be represented using the secant function, we can write sin 5pi/12 as √(sec²(5pi/12)  1)/sec 5pi/12. The value of sec 5pi/12 is equal to 3.863703.
What is the Value of Sin 5pi/12 in Terms of Cot 5pi/12?
We can represent the sine function in terms of the cotangent function using trig identities, sin 5pi/12 can be written as 1/√(1 + cot²(5pi/12)). Here, the value of cot 5pi/12 is equal to 0.2679.
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