જો $\tan A=\frac{1}{\sqrt{x(x^2+x+1)}}, \tan B=\frac{\sqrt{x}}{\sqrt{x^2+x+1}}$ અને $\tan C=\sqrt{x^{-1}+x^{-2}+x^{-3}}$ હોય,તો:

  • A
    $A+B=C$
  • B
    $A+B=2C$
  • C
    $A+B=3C$
  • D
    $A+B=4C$

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જો $\cos (A - B) = \frac{3}{5}$ અને $\tan A \tan B = 2$ હોય,તો

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

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