यदि $\cos A = \frac{3}{4}$ है,तो $32\sin \left( \frac{A}{2} \right)\sin \left( \frac{5A}{2} \right) = $

  • A
    $7$
  • B
    $8$
  • C
    $11$
  • D
    इनमें से कोई नहीं

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यदि सर्वसमिका $\cos^4 \theta = a \cos 4\theta + b \cos 2\theta + c$ कुछ $a, b, c \in \mathbb{Q}$ के लिए सत्य है,तो $(a, b, c) =$

यदि $\sqrt{\frac{1+\cos A}{1-\cos A}}=\frac{x}{y}$ है,तो $\tan A$ का मान किसके बराबर है?

सिद्ध कीजिए कि $\sin 2x + 2 \sin 4x + \sin 6x = 4 \cos^2 x \sin 4x$.

यदि $2\cos^2 \theta - 2\sin^2 \theta = 1$ है,तो $\theta = \dots ^\circ$.

सिद्ध कीजिए कि: $\cos 4x = 1 - 8 \sin^2 x \cos^2 x$

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