ત્રિકોણમિતીય વિધેય $\cot \left(-\frac{15 \pi}{4}\right)$ ની કિંમત શોધો.

  • A
    $1$
  • B
    $-1$
  • C
    $0$
  • D
    $\sqrt{3}$

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$\sin ^2 \frac{\pi}{8} + \sin ^2 \frac{3\pi}{8} + \sin ^2 \frac{5\pi}{8} + \sin ^2 \frac{7\pi}{8}$ નું મૂલ્ય શોધો.

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