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જો $\sin x + \sin y = \frac{7}{5}$ અને $\cos x + \cos y = \frac{1}{5}$ હોય,તો $\sin(x + y)$ ની કિંમત શોધો.

જો $\sin 2\theta + \sin 2\phi = 1/2$ અને $\cos 2\theta + \cos 2\phi = 3/2$ હોય,તો $\cos^2(\theta - \phi) = $

જો $(\sin \theta - \operatorname{cosec} \theta)^2 + (\cos \theta + \sec \theta)^2 = 5$ અને $\theta$ ત્રીજા ચરણમાં હોય,તો $(\sin \theta + \cos \theta)^3 = $

જો $\sin x \cosh y = \cos \theta$ અને $\cos x \sinh y = \sin \theta$ હોય,તો $\sinh^2 y =$

જો $\alpha = 22^\circ 30'$ હોય,તો $(1 + \cos \alpha )(1 + \cos 3\alpha )(1 + \cos 5\alpha )(1 + \cos 7\alpha )$ ની કિંમત શોધો.

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