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સાબિત કરો કે $\cos \left(\frac{3 \pi}{4}+x\right)-\cos \left(\frac{3 \pi}{4}-x\right)=-\sqrt{2} \sin x$.

જો $2 \sin \left(\theta+\frac{\pi}{3}\right)=\cos \left(\theta-\frac{\pi}{6}\right)$ હોય,તો $\tan \theta=$

જો $\frac{x}{\cos \alpha} = \frac{y}{\cos \left(\frac{2 \pi}{3} - \alpha\right)} = \frac{z}{\cos \left(\frac{2 \pi}{3} + \alpha\right)}$ હોય,તો $(x + y + z)$ ની કિંમત કેટલી થાય?

$\sin 75^\circ = $

ધારો કે $\cos (\alpha+\beta)=\frac{4}{5}$ અને $\sin (\alpha-\beta)=\frac{5}{13}$,જ્યાં $0 \leq \alpha, \beta \leq \frac{\pi}{4}$,તો $\tan 2 \alpha=$

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