Trigonometry Examples

$\sin^{2} (x) + \cos^{2} (x) = 1$

Step 1

Start on the left side.

$\sin^{2} (x) + \cos^{2} (x)$

Step 2

Apply pythagorean identity.

$1$

Step 3

Because the two sides have been shown to be equivalent, the equation is an identity.

$\sin^{2} (x) + \cos^{2} (x) = 1$ is an identity