यदि $A=35^{\circ}, B=15^{\circ}$ और $C=40^{\circ}$ है,तो $\tan A \cdot \tan B+\tan B \cdot \tan C+\tan C \cdot \tan A$ का मान ज्ञात कीजिए।

  • A
    $0$
  • B
    $1$
  • C
    $2$
  • D
    $3$

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$\frac{1}{4} [\sqrt{3} \cos 23^\circ - \sin 23^\circ] = $

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

$\cos 12^\circ + \cos 84^\circ + \cos 156^\circ + \cos 132^\circ$ का मान ज्ञात कीजिए।

यदि $\sin A = \frac{4}{5}$ और $\cos B = -\frac{12}{13}$ है,जहाँ $A$ और $B$ क्रमशः प्रथम और तृतीय चतुर्थांश में स्थित हैं,तो $\cos(A + B) = $

यदि $\frac{\sin(x+y)}{\sin(x-y)} = \frac{a+b}{a-b}$ है,तो $\frac{\tan x}{\tan y} = $

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