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यदि $x = \tan 15^{\circ}$,$y = \operatorname{cosec} 75^{\circ}$ और $z = 4 \sin 18^{\circ}$ है,तो :

$\frac{\sin x}{1+\cos x} + \frac{1+\cos x}{\sin x} = ?$

यदि $A$ और $B$ संपूरक कोण हैं,तो $\sin^{2} \frac{A}{2} + \sin^{2} \frac{B}{2} =$

$\text{sech}(i\pi)$ का मान है

यदि $x \neq 0$ है,तो $\frac{\sin (\pi+x) \cos (\frac{\pi}{2}+x) \tan (\frac{3 \pi}{2}-x) \cot (2 \pi-x)}{\sin (2 \pi-x) \cos (2 \pi+x) \operatorname{cosec}(-x) \sin (\frac{3 \pi}{2}+x)} = $

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