Which identity relates the square of the secant and the square of the tangent of an angle?
Show answer
1 + tan^2(x) = sec^2(x)
This is one of the three Pythagorean identities. It is derived by dividing the primary identity (sin^2 + cos^2 = 1) by cos^2(x).
Also asked as:
- What is the trigonometric identity that involves tan^2(x) and sec^2(x)?