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$\sin 75^{\circ}$ ની કિંમત શોધો.

સાબિત કરો કે: $(\cos x+\cos y)^{2}+(\sin x-\sin y)^{2}=4 \cos ^{2} \frac{x+y}{2}$

$\frac{\sin \theta + \sin 3 \theta}{\cos \theta + \cos 3 \theta}$ નું મૂલ્ય શું છે?

જો $0 < A < B < \frac{\pi}{4}$,$\cos (A+B) = \frac{11}{61}$ અને $\sin (A-B) = \frac{24}{25}$ હોય,તો $\sin 2A + \sin 2B = $

જો $\cos \theta = \frac{8}{17}$ અને $\theta$ એ $1^{st}$ ચરણમાં હોય,તો $\cos (30^\circ + \theta) + \cos (45^\circ - \theta) + \cos (120^\circ - \theta)$ ની કિંમત શોધો.

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