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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 $\tan 2 \alpha=$

$(\cos \alpha+\cos \beta)^2+(\sin \alpha+\sin \beta)^2$ ની કિંમત શું છે?

સાબિત કરો કે $\frac{\tan (\frac{\pi}{4}+x)}{\tan (\frac{\pi}{4}-x)} = (\frac{1+\tan x}{1-\tan x})^{2}$.

$\tan \frac{2\pi}{5} - \tan \frac{\pi}{15} - \sqrt{3} \tan \frac{2\pi}{5} \tan \frac{\pi}{15}$ ની કિંમત શોધો.

જો $\sin A = n \sin B$ હોય,તો $\frac{n - 1}{n + 1} \tan \frac{A + B}{2} = $

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