यदि $\sin A + \sin B = \frac{1}{2}$ और $\cos A + \cos B = 1$ है,तो $\sin \left(\frac{A-B}{2}\right)$ का मान ज्ञात कीजिए।

  • A
    $\pm \frac{\sqrt{13}}{4}$
  • B
    $\pm \frac{\sqrt{11}}{4}$
  • C
    $\pm \frac{\sqrt{7}}{4}$
  • D
    $\pm \frac{\sqrt{17}}{4}$

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$\cos^2 73^\circ + \cos^2 47^\circ + (\cos 73^\circ \cdot \cos 47^\circ)$ का सटीक मान क्या है?

यदि $\cosh 2x = 199$ है,तो $\operatorname{coth} x =$

$2 \sin(12^{\circ}) - \sin(72^{\circ})$ का मान क्या है?

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