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 શોધો:

  • A
    $\frac{a}{d}$
  • B
    $\frac{c}{d}$
  • C
    $\frac{b}{c}$
  • D
    $\frac{d}{a}$

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જો $\sin x + \sin^2 x = 1$ હોય,તો $\cos^{12} x + 3\cos^{10} x + 3\cos^8 x + \cos^6 x - 2$ ની કિંમત કેટલી થાય?

Difficult
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$4 \cos \frac{7 \theta}{2} \cos \frac{3 \theta}{2} \sin 5 \theta = $

જો $\tan \theta + \cot \theta = 4$ હોય,તો $\tan^{4} \theta + \cot^{4} \theta = $

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

$\frac{\sin 1^{\circ}+\sin 2^{\circ}+\ldots+\sin 89^{\circ}}{2(\cos 1^{\circ}+\cos 2^{\circ}+\ldots+\cos 44^{\circ})+1} = $

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