$\cos \left(22 \frac{1}{2}\right)^{\circ}$ का मान क्या है?

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

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$\cos \left(\frac{\pi}{7}\right) \cos \left(\frac{2 \pi}{7}\right) \cos \left(\frac{4 \pi}{7}\right) = $

$\tan \alpha + 2 \tan 2 \alpha + 4 \tan 4 \alpha + 8 \cot 8 \alpha = $

$\tan \alpha + 2\tan 2\alpha + 4\tan 4\alpha + 8\cot 8\alpha = $

यदि $\cot A=\frac{11}{60}$,$\cos B=\frac{7}{25}$ और न तो $A$ और न ही $B$ प्रथम चतुर्थांश में है,तो $\left(A+\frac{B}{2}\right)$ किस चतुर्थांश में स्थित है?

यदि $3 \sin x + 4 \cos x = 5$ है,तो $6 \tan \frac{x}{2} - 9 \tan^2 \frac{x}{2}$ का मान ज्ञात कीजिए।

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