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$\sin ^2 5^{\circ}+\sin ^2 10^{\circ}+\sin ^2 15^{\circ}+\ldots+\sin ^2 90^{\circ}$ ની કિંમત શોધો.

જો $0 \le x \le \pi$ અને $81^{\sin^2 x} + 81^{\cos^2 x} = 30$ હોય,તો $x =$

જો અમુક $x \in (\pi, \frac{3\pi}{2})$ માટે $\cot x = \frac{5}{12}$ હોય,તો $\sin 7x(\cos \frac{13x}{2} + \sin \frac{13x}{2}) + \cos 7x(\cos \frac{13x}{2} - \sin \frac{13x}{2})$ ની કિંમત શોધો.

ધારો કે $S = \{\theta \in [0, 2\pi] : 8^{2 \sin^2 \theta} + 8^{2 \cos^2 \theta} = 16\}$. તો $n(S) + \sum_{\theta \in S} \left(\sec \left(\frac{\pi}{4} + 2\theta\right) \operatorname{cosec} \left(\frac{\pi}{4} + 2\theta\right)\right)$ ની કિંમત શોધો.

જો $3 \sin^4 x + 2 \cos^4 x = \frac{6}{5}$ અને $x$ એ લઘુકોણ હોય,તો $\tan 2x =$

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