Trigonometrical Equations
medium

यदि $\tan \theta  + \tan 2\theta  + \sqrt 3 \tan \theta \tan 2\theta  = \sqrt 3 ,$ तब

A

$\theta = (6n + 1)\pi /18,\,\forall n \in I$

B

$\theta = (6n + 1)\pi /9,\,\forall n \in I$

C

$\theta = (3n + 1)\pi /9,\,\forall n \in I$

D

इनमें से कोई नहीं

Solution

दिया गया सम्बन्ध है,

$\tan \theta  + \tan 2\theta  + \sqrt 3 \tan \theta \tan 2\theta  = \sqrt 3 $

$\Rightarrow$ $\,\tan \theta  + \tan 2\theta  = \sqrt 3 (1 – \tan \theta \tan 2\theta )$

$\Rightarrow$ $\frac{{\tan \theta  + \tan 2\theta }}{{1 – \tan \theta \tan 2\theta }} =  \sqrt 3 $

$\Rightarrow$   $\tan 3\theta  = \tan (\pi /3)$

$\Rightarrow$  $3\theta  = n\pi  + \frac{\pi }{3}$ 

$\Rightarrow$ $\theta  = (3n + 1)\frac{\pi }{9}$.

Standard 11
Mathematics

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