3.Trigonometrical Ratios, Functions and Identities
easy

જો $\tan \,(A + B) = p,\,\,\tan \,(A - B) = q,$ તો $\tan \,2A$ ની કિમત $p$ અને $q$ માં મેળવો.

A

$\frac{{p + q}}{{p - q}}$

B

$\frac{{p - q}}{{1 + pq}}$

C

$\frac{{p + q}}{{1 - pq}}$

D

$\frac{{1 + pq}}{{1 - p}}$

Solution

(c) $2A = (A + B) + (A – B)$

$ \Rightarrow $$\tan 2A = \frac{{\tan (A + B) + \tan (A – B)}}{{1 – \tan (A + B)\tan (A – B)}}$

$= \frac{{p + q}}{{1 – pq}}$.

Standard 11
Mathematics

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