જો $A > B$ અને $\tan A - \tan B = x$ તથા $\cot B - \cot A = y$ હોય,તો $\cot (A - B) = $

  • A
    $\frac{1}{y} - \frac{1}{x}$
  • B
    $\frac{1}{x} - \frac{1}{y}$
  • C
    $\frac{1}{x} + \frac{1}{y}$
  • D
    $\frac{xy}{x - y}$

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$\cos A + \cos (240^\circ + A) + \cos (240^\circ - A) = $

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જો $\sin \theta = \frac{-12}{13}$,$\cos \phi = \frac{-4}{5}$ અને $\theta, \phi$ ત્રીજા ચરણમાં હોય,તો $\tan(\theta - \phi) =$

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