Trigonometry Examples

$\tan (- t) = - \tan (t)$

Step 1

Start on the left side.

$\tan (- t)$

Step 2

Since $\tan (- t)$ is an odd function, rewrite $\tan (- t)$ as $- \tan (t)$ .

$- \tan (t)$

Step 3

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

$\tan (- t) = - \tan (t)$ is an identity