જો $\tan A = \frac{5}{6}$ અને $\tan B = \frac{1}{11}$ હોય,તો $A + B = $

  • A
    $\frac{-\pi}{4}$
  • B
    $\frac{-\pi}{3}$
  • C
    $\frac{\pi}{3}$
  • D
    $\frac{\pi}{4}$

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$\frac{\sinh(x+y) + \sinh(x-y)}{\cosh(x+y) - \cosh(x-y)} = $

જો $\cos \theta = \frac{3}{5}$ અને $\cos \phi = \frac{4}{5}$ હોય,જ્યાં $\theta$ અને $\phi$ ધન લઘુકોણ છે,તો $\cos \frac{\theta - \phi}{2} = $

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

$\tan 15^\circ = $

સાબિત કરો કે $\frac{\cos 7x + \cos 5x}{\sin 7x - \sin 5x} = \cot x$.

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