જો $\cos x + \cos y = -\cos \alpha$ અને $\sin x + \sin y = -\sin \alpha$ હોય,તો $\cot \left(\frac{x+y}{2}\right) = $

  • A
    $-\cot \alpha$
  • B
    $\cot \alpha$
  • C
    $-\tan \alpha$
  • D
    $\tan \alpha$

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જો $\frac{\cos x}{\cos (x-2 y)}=\lambda$ હોય,તો $\tan (x-y) \tan y$ ની કિંમત શું થાય?

કિંમત શોધો: $(\cos 252^{\circ} - \sin 126^{\circ})(\cos 252^{\circ} + \sin 126^{\circ})(\sin^2 126^{\circ} + \sin^2 186^{\circ} + \sin^2 66^{\circ})$

$\sin ^3 10^{\circ}+\sin ^3 50^{\circ}-\sin ^3 70^{\circ}=$

જો $\tan \theta + \sin \theta = m$ અને $\tan \theta - \sin \theta = n$ હોય,તો

સમીકરણોની પ્રણાલી: $2x \cos^2 \theta + y \sin 2\theta - 2 \sin \theta = 0$,$x \sin 2\theta + 2y \sin^2 \theta = -2 \cos \theta$,અને $x \sin \theta - y \cos \theta = 0$,$\theta$ ના તમામ મૂલ્યો માટે,શું કરી શકે છે:

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