$\frac{{\cot^2 15^\circ - 1}}{{\cot^2 15^\circ + 1}} = $

  • A
    $\frac{1}{2}$
  • B
    $\frac{\sqrt{3}}{2}$
  • C
    $\frac{3\sqrt{3}}{4}$
  • D
    $\sqrt{3}$

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$\frac{1 + \sin A - \cos A}{1 + \sin A + \cos A} = $

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જો $\frac{\cos x}{a} = \frac{\cos (x + \theta)}{b} = \frac{\cos (x + 2\theta)}{c} = \frac{\cos (x + 3\theta)}{d}$ હોય,તો $\left( \frac{a + c}{b + d} \right)$ ની કિંમત શું થાય :-

જો $x \sin 45^{\circ} = y \operatorname{cosec} 30^{\circ}$ હોય,તો $\frac{x^{4}}{y^{4}}$ ની કિંમત કેટલી થાય ($^{3}$ માં)?

જો $\tan x = \frac{b}{a}$ હોય,તો $\sqrt {\frac{{a + b}}{{a - b}}} + \sqrt {\frac{{a - b}}{{a + b}}} = $

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