Question

Simplify the following using trigonometric identities:
( - tan² (x) + sec² (x) ) - sin² (x)

Answer 1

cos^2 (x)

Explanation:

Use two of the Pythagorean Identities. See image.

You can rearrange the Pyth Identities. Like subtract the same thing from both sides.

Your question simplifies in just two steps. See image.