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$\cos 15^{\circ} - \sin 15^{\circ}$ का मान है ......

यदि $\tan A = -\frac{1}{2}$ और $\tan B = -\frac{1}{3}$ है,तो $A + B = $

$\frac{\sinh(x+y) + \sinh(x-y)}{\cosh(x+y) - \cosh(x-y)} = $

यदि $x + y = \frac{\pi}{4}$ है, तो $(1 + \tan x)(1 + \tan y) =$ का मान क्या होगा?

सिद्ध कीजिए कि: $(\cos x+\cos y)^{2}+(\sin x-\sin y)^{2}=4 \cos ^{2} \frac{x+y}{2}$

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