यदि $\frac{\tan 3A}{\tan A} = a$ है,तो $\frac{\sin 3A}{\sin A}$ का मान ज्ञात कीजिए।

  • A
    $\frac{2a}{a+1}$
  • B
    $\frac{2a}{a-1}$
  • C
    $\frac{a}{a+1}$
  • D
    $\frac{a}{a-1}$

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$\cos 15^{\circ} \cos 7.5^{\circ} \sin 7.5^{\circ}$ का मान क्या है?

यदि $\frac{2 \sin \theta}{1+\cos \theta+\sin \theta}=y$ है,तो $\frac{1-\cos \theta+\sin \theta}{1+\sin \theta}=$

$\sin 20^\circ \sin 40^\circ \sin 60^\circ \sin 80^\circ = $

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