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

  • A
    $1$
  • B
    $2$
  • C
    $5/2$
  • D
    $1/3$

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$\sin \left(\frac{\pi}{3}+x\right)-\cos \left(\frac{\pi}{6}+x\right) = $

સાબિત કરો કે $\frac{\sin x-\sin y}{\cos x+\cos y}=\tan \left(\frac{x-y}{2}\right)$

$4 \sin 5^\circ \sin 55^\circ \sin 65^\circ$ ની કિંમત શોધો.

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