જો $\cos (\alpha+\beta)=\frac{4}{5}$,$\sin (\alpha-\beta)=\frac{5}{13}$ અને $\alpha, \beta$ એ $0$ અને $\frac{\pi}{4}$ ની વચ્ચે હોય,તો $\tan 2 \alpha$ ની કિંમત શોધો.

  • A
    $\frac{56}{33}$
  • B
    $\frac{33}{56}$
  • C
    $\frac{16}{65}$
  • D
    $\frac{60}{61}$

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જો $\tan \left( \frac{\pi }{4} + \theta \right) + \tan \left( \frac{\pi }{4} - \theta \right) = \lambda \sec 2\theta$ હોય,તો $\lambda$ =

$\cos 105^\circ + \sin 105^\circ$ નું મૂલ્ય શું છે?

$1 + \cos 2x + \cos 4x + \cos 6x = $

સાબિત કરો કે $\sin (n+1) x \sin (n+2) x + \cos (n+1) x \cos (n+2) x = \cos x$.

$\frac{\tan 80^{\circ}-\tan 10^{\circ}}{\tan 70^{\circ}}$ ની કિંમત શોધો.

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