$cosec^2 \theta = \frac{4xy}{(x + y)^2}$ એ ત્યારે જ સાચું છે જો

  • A
    $x + y \neq 0$
  • B
    $x = y, x \neq 0$
  • C
    $x = y$
  • D
    $x \neq 0, y \neq 0$

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જો $A+B+C=\frac{\pi}{4}$ હોય,તો $4 \cos \frac{A}{2} \cos \frac{B}{2} \cos \frac{C}{2}-\cos \frac{\pi}{8}=$

જો $A + B + C = \pi$ અને $\sin \left( A + \frac{C}{2} \right) = k \sin \frac{C}{2}$ હોય,તો $\tan \frac{A}{2} \tan \frac{B}{2} = $

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