જો $\theta$ અને $\phi$ એ $1^{st}$ ચરણમાં આવેલા ખૂણાઓ હોય કે જેથી $\tan \theta = 1/7$ અને $\sin \phi = 1/\sqrt{10}$ હોય,તો:

  • A
    $\theta + 2\phi = 90^\circ$
  • B
    $\theta + 2\phi = 60^\circ$
  • C
    $\theta + 2\phi = 30^\circ$
  • D
    $\theta + 2\phi = 45^\circ$

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જો $\tan A = \frac{1}{\sqrt{x(x^2+x+1)}}, \tan B = \frac{\sqrt{x}}{\sqrt{x^2+x+1}}$ અને $\tan C = (x^{-3}+x^{-2}+x^{-1})^{\frac{1}{2}}$,જ્યાં $0 < A, B, C < \frac{\pi}{2}$,તો $A+B$ ની કિંમત શું થાય?

$\cos(36^{\circ}-A) \cos(36^{\circ}+A) + \cos(54^{\circ}+A) \cos(54^{\circ}-A) = $

$\cos ^2\left(\frac{\pi}{6}+\theta\right)-\sin ^2\left(\frac{\pi}{6}-\theta\right)$ ની કિંમત શોધો.

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