$\cos 105^\circ + \sin 105^\circ$ का मान है

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

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$1+\cos 10^{\circ}+\cos 20^{\circ}+\cos 30^{\circ}=$

$\tan 15^{\circ}$ का मान ज्ञात कीजिए:

$\sin 75^\circ = $

यदि $\cos (\alpha + \beta) = \frac{3}{5}$,$\sin (\alpha - \beta) = \frac{5}{13}$ और $0 < \alpha, \beta < \frac{\pi}{4}$ है,तो $\tan (2\alpha)$ का मान ज्ञात कीजिए।

यदि $\tan A = -\frac{1}{2}$ और $\tan B = -\frac{1}{3}$ है,तो $A + B = $

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