Value of tan ( - 945° ) is

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3.Trigonometrical Ratios, Functions and Identities

easy

The value of $\tan ( - 945^\circ )$ is

A

$-1$

B

$-2$

C

$-3$

D

$-4$

Solution

(a) $\tan ( – 945^\circ ) = \tan [ – (945^\circ )]$

$ = – \tan [(2 \times 360^\circ + 225^\circ )]$

$ = – \tan [225^\circ ] = – \tan 45^\circ = – 1$.

Standard 11

Mathematics

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