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

  • A
    $\sin \frac{A - B}{2}$
  • B
    $\tan \frac{A - B}{2}$
  • C
    $\cot \frac{A - B}{2}$
  • D
    આમાંથી કોઈ નહીં

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જો $\sin (A+B) \sin (A-B)+\cos (A+B) \cos (A-B)=\frac{1}{2}$ અને $0 < B < \frac{\pi}{2}$ હોય,તો $B=$

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

$\frac{\sin(B + A) + \cos(B - A)}{\sin(B - A) + \cos(B + A)} = $

$\cos ^4 \frac{\pi}{24} - \sin ^4 \frac{\pi}{24} = $

જો $A=35^{\circ}, B=15^{\circ}$ અને $C=40^{\circ}$ હોય,તો $\tan A \cdot \tan B+\tan B \cdot \tan C+\tan C \cdot \tan A$ ની કિંમત શોધો.

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