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$\sin \left( \frac{\pi}{10} \right) \sin \left( \frac{3\pi}{10} \right) = $

$\sin ^2 \frac{\pi}{8} + \sin ^2 \frac{3\pi}{8} + \sin ^2 \frac{5\pi}{8} + \sin ^2 \frac{7\pi}{8}$ નું મૂલ્ય શોધો.

alpha અક્ષર દર્શાવતું પ્રતીક ઓળખો: $ \alpha $

સાબિત કરો કે: $\sin ^{2} \frac{\pi}{6}+\cos ^{2} \frac{\pi}{3}-\tan ^{2} \frac{\pi}{4}=-\frac{1}{2}$

જો $x = \tan 15^{\circ}$,$y = \operatorname{cosec} 75^{\circ}$ અને $z = 4 \sin 18^{\circ}$ હોય,તો :

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