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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यदि $0 < A < B < \frac{\pi}{4}$,$\cos (A+B) = \frac{11}{61}$ और $\sin (A-B) = \frac{24}{25}$ है,तो $\sin 2A + \sin 2B = $

यदि $\cos (A - B) = \frac{3}{5}$ और $\tan A \tan B = 2$ है,तो

सिद्ध कीजिए कि: $\sin 3x + \sin 2x - \sin x = 4 \sin x \cos \frac{x}{2} \cos \frac{3x}{2}$

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$\sin \frac{5 \pi}{12} \sin \frac{\pi}{12}$ का मान है

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) = $

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