જો $\sin A + \sin B = C$ અને $\cos A + \cos B = D$ હોય,તો $\sin (A + B)$ ની કિંમત શોધો.

  • A
    $CD$
  • B
    $\frac{CD}{C^2 + D^2}$
  • C
    $\frac{C^2 + D^2}{2CD}$
  • D
    $\frac{2CD}{C^2 + D^2}$

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$\cos \frac{\pi}{12} = ?$

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