જો $\sin (A+B) \sin (A-B)+\cos (A+B) \cos (A-B)=\frac{1}{2}$ અને $0 < B < \frac{\pi}{2}$ હોય,તો $B=$

  • A
    $\frac{\pi}{6}$
  • B
    $\frac{\pi}{4}$
  • C
    $\frac{\pi}{3}$
  • D
    $\frac{5 \pi}{12}$

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જો $\tan A + \tan B = x$ અને $\cot A + \cot B = y$ હોય,તો $\tan (A + B) =$

$\cos \alpha \sin (\beta-\gamma) + \cos \beta \sin (\gamma-\alpha) + \cos \gamma \sin (\alpha-\beta)$ ની કિંમત શું થાય?

જો $\cos (\alpha + \beta) = \frac{3}{5}$,$\sin (\alpha - \beta) = \frac{5}{13}$ અને $0 < \alpha, \beta < \frac{\pi}{4}$ હોય,તો $\tan (2\alpha)$ ની કિંમત શોધો.

જો $\sin \theta = \frac{-12}{13}$,$\cos \phi = \frac{-4}{5}$ અને $\theta, \phi$ ત્રીજા ચરણમાં હોય,તો $\tan(\theta - \phi) =$

સાબિત કરો કે $\cot 4x(\sin 5x + \sin 3x) = \cot x(\sin 5x - \sin 3x)$

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