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$\sin 50^\circ - \sin 70^\circ + \sin 10^\circ = $

$(\sin 210^{\circ})(\sin 585^{\circ})$ નું મૂલ્ય શું છે?

$\sin 15^\circ + \cos 105^\circ = $

$\cos ^2\left(\frac{7 \pi}{8}\right)+\cos ^2\left(\frac{5 \pi}{8}\right)+\cos ^2\left(\frac{3 \pi}{8}\right)+\cos ^2\left(\frac{\pi}{8}\right)=$

જો $\sin \left( x + \frac{4\pi}{9} \right) = a$ અને $\frac{\pi}{9} < x < \frac{\pi}{3}$ હોય,તો $\cos \left( x + \frac{7\pi}{9} \right)$ ની કિંમત શોધો:

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