જો $\tan \alpha = \frac{m}{m + 1}$ અને $\tan \beta = \frac{1}{2m + 1}$ હોય,તો $\alpha + \beta = $

  • A
    $\frac{\pi}{3}$
  • B
    $\frac{\pi}{4}$
  • C
    $\frac{\pi}{6}$
  • D
    આમાંથી કોઈ નહીં

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જો $A + B = \frac{\pi}{4}$ હોય,તો $(1 + \tan A)(1 + \tan B) = $

જો $\tan A=\frac{1}{\sqrt{x(x^2+x+1)}}, \tan B=\frac{\sqrt{x}}{\sqrt{x^2+x+1}}$ અને $\tan C=\sqrt{x^{-1}+x^{-2}+x^{-3}}$ હોય,તો:

જો $\cos(\alpha + \beta) = \frac{4}{5}$ અને $\sin(\alpha - \beta) = \frac{5}{13}$,જ્યાં $0 \le \alpha, \beta \le \frac{\pi}{4}$ હોય,તો $\tan 2\alpha = $

$1+\cos 10^{\circ}+\cos 20^{\circ}+\cos 30^{\circ}=$

$\cos(18^{\circ}-A) \cos(18^{\circ}+A) - \cos(72^{\circ}-A) \cos(72^{\circ}+A)$ ની કિંમત શોધો.

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