First slide

Trigonometric Identities

Question

$T a n (- \frac{9 π}{4}) =$

Easy

A

0
B

$- 1$
C

$- \frac{1}{\sqrt{2}}$
D

$\frac{1}{\sqrt{2}}$

Solution

$\tan (- \frac{9 π}{4}) = - \tan (\frac{9 π}{4})$ $= - \tan (2 π + \frac{π}{4})$ $= - \tan \frac{π}{4} = - 1$

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