જો $\cos \theta = \frac{1}{2}\left( x + \frac{1}{x} \right)$ હોય,તો $\frac{1}{2}\left( x^2 + \frac{1}{x^2} \right) = $

  • A
    $\sin 2\theta $
  • B
    $\cos 2\theta $
  • C
    $\tan 2\theta $
  • D
    $\sec 2\theta $

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જો $\tan \theta = \frac{x \sin \phi}{1 - x \cos \phi}$ અને $\tan \phi = \frac{y \sin \theta}{1 - y \cos \theta}$ હોય,તો $\frac{x}{y} = $

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જો $A = 130^\circ$ અને $x = \sin A + \cos A$ હોય,તો

$\cot (45^\circ + \theta ) \cot (45^\circ - \theta ) = $

જો $\tan A = - \frac{1}{2}$ અને $\tan B = - \frac{1}{3}$ હોય,તો $A + B = $

જો $A + B + C = 270^o$ હોય,તો $\cos 2A + \cos 2B + \cos 2C + 4\sin A \sin B \sin C = $

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