यदि $\tan A + \tan B = x$ और $\cot A + \cot B = y$ है,तो $\tan (A + B) =$

  • A
    $\frac{xy}{x-y}$
  • B
    $\frac{xy}{y-x}$
  • C
    $\frac{xy}{x+y}$
  • D
    $\frac{x-y}{xy}$

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यदि $A$ और $B$ $(A > B)$ न्यून कोण हैं,$\sin (A-B)=\frac{16}{65}$ और $\sin B=\frac{5}{13}$ है,तो $\tan A+\cot A=$

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$\sin \left(\frac{\pi}{3}+x\right)-\cos \left(\frac{\pi}{6}+x\right) = $

$\cos 15^{\circ} - \sin 15^{\circ}$ का मान है

$\tan 15^{\circ}$ का मान ज्ञात कीजिए:

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