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$\cos \frac{\pi}{7} \cos \frac{2\pi}{7} \cos \frac{3\pi}{7} =$

$\frac{\tan x}{\tan 3x}$ का मान,जब भी परिभाषित हो,कभी भी किसके बीच नहीं होता है?

$\tan \left(\frac{7 \pi}{8}\right)$ का मान है

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

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

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