જો $\theta \in \left(0, \frac{\pi}{2}\right)$ માટે $\tan 3\theta \cdot \tan 2\theta \cdot \tan \theta + \tan 2\theta + \tan \theta = 1$ હોય,તો $\theta =$

  • A
    $\frac{\pi}{12}$
  • B
    $\frac{\pi}{4}$
  • C
    $\frac{\pi}{6}$
  • D
    $\frac{\pi}{3}$

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$\cos 12^\circ + \cos 84^\circ + \cos 156^\circ + \cos 132^\circ$ નું મૂલ્ય શોધો.

જો $\sin A = \frac{1}{\sqrt{10}}$ અને $\sin B = \frac{1}{\sqrt{5}}$,જ્યાં $A$ અને $B$ ધન લઘુકોણ છે,તો $A + B = $

ધારો કે $\tan \alpha = \frac{a}{a+1}$ અને $\tan \beta = \frac{1}{2a+1}$,તો $\alpha + \beta$ શું થાય?

જો $\frac{\pi}{2} < \alpha < \pi$ અને $\pi < \beta < \frac{3\pi}{2}$,જ્યાં $\sin \alpha = \frac{15}{17}$ અને $\tan \beta = \frac{12}{5}$ હોય,તો $\sin(\beta - \alpha)$ ની કિંમત શોધો. ($/221$ માં)

$\cos^2 \left( \frac{\pi}{6} + \theta \right) - \sin^2 \left( \frac{\pi}{6} - \theta \right) = $

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