જો $\cos (A + B) = \alpha \cos A \cos B + \beta \sin A \sin B$ હોય,તો $(\alpha, \beta) =$

  • A
    $(-1, -1)$
  • B
    $(-1, 1)$
  • C
    $(1, -1)$
  • D
    $(1, 1)$

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Similar Questions

જો $\theta+\phi=\frac{\pi}{4}$ હોય, તો $(1+\tan \theta)(1+\tan \phi)$ ની કિંમત કેટલી થાય?

$\cos^2 \left( \frac{\pi}{6} + \theta \right) - \sin^2 \left( \frac{\pi}{6} - \theta \right) = $

સાબિત કરો કે $\frac{\tan (\frac{\pi}{4}+x)}{\tan (\frac{\pi}{4}-x)} = (\frac{1+\tan x}{1-\tan x})^{2}$.

$\frac{\cos 10^o + \sin 10^o}{\cos 10^o - \sin 10^o} = $

કિંમત શોધો: $\cos^2 48^\circ - \sin^2 12^\circ$

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