जब $\theta = \frac{\pi}{15}$ है,तो $(1-\cos \theta)(1+\cos \theta)(1+\cot^2 \theta)$ का मान क्या होगा?

  • A
    $1$
  • B
    $\frac{1}{2}$
  • C
    $\frac{-1}{\sqrt{3}}$
  • D
    $2$

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$\sin 10^\circ + \sin 20^\circ + \sin 30^\circ + \dots + \sin 360^\circ$ का मान क्या है?

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यदि $A$ और $B$ धनात्मक न्यून कोण हैं जो $3 \cos^2 A + 2 \cos^2 B = 4$ और $\frac{3 \sin A}{\sin B} = \frac{2 \cos B}{\cos A}$ को संतुष्ट करते हैं,तो $A + 2B =$ ($^{\circ}$ में)

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