Trigonometric identities are equations that relate different trigonometric functions and are true for any value of the variable that is there in the domain. Basically, an identity is an equation that holds true for all the values of the variables present in it. The function of an angle i.e the angles and sides relationships is given by trigonometric functions. Sine, cosine, tangent, cotangent, Cos, Cosec are called the trigonometric functions. Let's look into the Cos Square theta formula below.
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