If cos A = frac{{√ 3 }}{2}, then tan 3A =

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3.Trigonometrical Ratios, Functions and Identities

easy

If $\cos A = \frac{{\sqrt 3 }}{2},$ then $\tan 3A = $

A

$0$

B

$1/2$

C

$1$

D

$\infty $

Solution

(d) We have $\cos A = \frac{{\sqrt 3 }}{2} $

$\Rightarrow A = {30^o}$

==> $\tan 3A = \tan {90^o} = \infty $.

Standard 11

Mathematics

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