यदि $\tan \alpha = \frac{1}{7}$ और $\tan \beta = \frac{1}{3}$ है,तो $\cos 2\alpha = $

  • A
    $\sin 2\beta$
  • B
    $\sin 4\beta$
  • C
    $\sin 3\beta$
  • D
    इनमें से कोई नहीं

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यदि $\tan x = (\sin 45^{\circ})(\cos 45^{\circ}) + \sin 30^{\circ}$ है,तो $x$ का मान ($^{\circ}$ में) ज्ञात कीजिए।

$\tan 1^{\circ} \tan 2^{\circ} \tan 3^{\circ} \ldots \tan 89^{\circ}$ का मान क्या है?

$E = \frac{25 \sec^4 x - 50 \sec^2 x + 74}{\tan^2 x}$ का न्यूनतम मान क्या है?

$2\cos^2 \theta - 2\sin^2 \theta = 1$,तो $\theta = \dots \dots ^\circ$

यदि $\tan A = \frac{1 - \cos B}{\sin B}$ है,तो $\tan 2A =$

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