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

  • A
    $\sin A$
  • B
    $\cos A$
  • C
    $\tan A$
  • D
    $\cot A$

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

જો બે લઘુકોણ $A$ અને $B$ એવા હોય કે $A \neq B$ અને $\frac{x}{y}=\frac{\cos A}{\cos B}$,તો $\frac{x \tan A-y \tan B}{x+y}=$

જો $\sin x + \sin y = \frac{1}{2}$ અને $\cos x + \cos y = 1$ હોય,તો $\tan(x + y) = $

$2 \cosh (x+y) \sinh (x-y) + \sinh 2y =$

જો $\sin A = \frac{1}{\sqrt{10}}$ અને $\sin B = \frac{1}{\sqrt{5}}$,જ્યાં $A$ અને $B$ ધન લઘુકોણ છે,તો $A + B = $

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