$\cos \theta + \sin \theta$ का न्यूनतम मान क्या है?

  • A
    $0$
  • B
    $-\sqrt{2}$
  • C
    $1/2$
  • D
    $\sqrt{2}$

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$\frac{{\sin 3A - \cos \left( {\frac{\pi }{2} - A} \right)}}{{\cos A + \cos (\pi + 3A)}} = $

यदि $A + B + C = \frac{3\pi}{2}$ है,तो $\cos 2A + \cos 2B + \cos 2C = $

$\tan \frac{2\pi}{5} - \tan \frac{\pi}{15} - \sqrt{3} \tan \frac{2\pi}{5} \tan \frac{\pi}{15}$ का मान ज्ञात कीजिए।

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