यदि $\tan \theta = \frac{\sin \alpha - \cos \alpha}{\sin \alpha + \cos \alpha}$ और $0 \leq \alpha \leq \frac{\pi}{2}$ है,तो $\cos 2 \theta$ का मान क्या है?

  • A
    $\cos 2 \alpha$
  • B
    $\sin \alpha$
  • C
    $\cos \alpha$
  • D
    $\sin 2 \alpha$

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Similar Questions

$\cos^2 48^{\circ} - \sin^2 12^{\circ}$ का मान ज्ञात कीजिए,यदि $\sin 18^{\circ} = \frac{\sqrt{5}-1}{4}$ है।

यदि $\frac{\sin(x + y)}{\sin(x - y)} = \frac{a + b}{a - b}$ है,तो $\frac{\tan x}{\tan y}$ का मान ज्ञात कीजिए।

सिद्ध कीजिए कि $\frac{\sin (x+y)}{\sin (x-y)} = \frac{\tan x + \tan y}{\tan x - \tan y}$.

$\cos ^{2} 75^{\circ}+\cos ^{2} 45^{\circ}+\cos ^{2} 15^{\circ}-\cos ^{2} 30^{\circ}-\cos ^{2} 60^{\circ}$ का मान है

सिद्ध कीजिए कि $\frac{\cos 4x + \cos 3x + \cos 2x}{\sin 4x + \sin 3x + \sin 2x} = \cot 3x$.

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