જો $3 \sin (\alpha-\beta)=5 \cos (\alpha+\beta)$ અને $\alpha+\beta \neq \frac{\pi}{2}$ હોય,તો $\frac{\tan \left(\frac{\pi}{4}-\alpha\right)}{\tan \left(\frac{\pi}{4}-\beta\right)}=$

  • A
    $0$
  • B
    $-4$
  • C
    $-\frac{1}{4}$
  • D
    $\frac{1}{2}$

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જો $\sin x + \cos x = a$,જ્યાં $a \in [-\sqrt{2}, \sqrt{2}] - \{-1, 1\}$,હોય તો $\sum_{n=1}^{\infty} (\sin^n x + \cos^n x)$ ની કિંમત શોધો.

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$\sin \frac{\pi}{16} \sin \frac{3\pi}{16} \sin \frac{5\pi}{16} \sin \frac{7\pi}{16}$ નું મૂલ્ય શું છે?

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