यदि $\cos x + \sin x = \frac{1}{2}$ और $0 < x < \pi$ है,तो $\tan x =$

  • A
    $\frac{4+\sqrt{7}}{3}$
  • B
    $\frac{4-\sqrt{7}}{3}$
  • C
    $\frac{-4+\sqrt{7}}{3}$
  • D
    $\frac{-4-\sqrt{7}}{3}$

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समीकरण $(\sin x - x)(\cos x - x^2) = 0$ के वास्तविक हलों की संख्या है

$INCORRECT$ (गलत) कथन चुनिए।

यदि $\sin A + \sin 2A = x$ और $\cos A + \cos 2A = y$ है,तो $({x^2} + {y^2})({x^2} + {y^2} - 3) = $

यदि $P = \sin \frac{2 \pi}{7} + \sin \frac{4 \pi}{7} + \sin \frac{8 \pi}{7}$ और $Q = \cos \frac{2 \pi}{7} + \cos \frac{4 \pi}{7} + \cos \frac{8 \pi}{7}$ है,तो बिंदु $(P, Q)$ किस त्रिज्या वाले वृत्त पर स्थित है?

$\cos ^3\left(\frac{\pi}{8}\right) \cos \left(\frac{3 \pi}{8}\right)+\sin ^3\left(\frac{\pi}{8}\right) \sin \left(\frac{3 \pi}{8}\right) = $

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