यदि $(1 + \tan \theta )(1 + \tan \phi ) = 2$ है,तो $\theta + \phi = \dots ^\circ$

  • A
    $30$
  • B
    $45$
  • C
    $60$
  • D
    $75$

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सिद्ध कीजिए कि $\cos 2x \cos \frac{x}{2} - \cos 3x \cos \frac{9x}{2} = \sin 5x \sin \frac{5x}{2}$

सिद्ध कीजिए कि $\frac{\sin (x+y)}{\sin (x-y)} = \frac{\tan x + \tan y}{\tan x - \tan y}$.

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