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यदि $\sin(x+3\alpha) + 3\sin(x-\alpha) = 0$ है,तो

यदि $\tan x = \frac{3}{4}$ और $\pi < x < \frac{3\pi}{2}$ है,तो $\cos \frac{x}{2}$ का मान ज्ञात कीजिए।

यदि $\cosh(x) = \frac{5}{4}$ है,तो $\cosh(3x)$ का मान क्या होगा?

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

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

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