Which of the following is a trigonometric identity?
a. cot(theta)+tan(theta)=1
b. sec^2(theta)+csc^2(theta)=1
c. tan^2(theta)=sin^2(theta)×sec^2 (theta)
d. cos^2(theta)=sec^2 (theta)×tan^2(theta)

C) .

Step-by-step explanation:

Given : trigonometric identity.

To find : which of the following is a trigonometric identity.

Solution : We have given trigonometric identity.

By the trigonometric identity :

Cos ( theta) =  .

tan( theta) =  .

Taking square both sides

Plugging the identity I Cos ( theta) =  .

Therefore, C) .

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step-by-step explanation: