यदि $\sqrt{3} \cos \theta + \sin \theta > 0$ है,तो:

  • A
    $-\frac{\pi}{2} < \theta < \frac{\pi}{2}$
  • B
    $-\frac{\pi}{3} < \theta < \frac{2 \pi}{3}$
  • C
    $-\frac{2 \pi}{3} < \theta < \frac{\pi}{3}$
  • D
    $-\frac{\pi}{6} < \theta < \frac{5 \pi}{6}$

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$\alpha \in R$ के लिए $(\cos \alpha, \sin \alpha)$ और $(\cos (\pi+\alpha), \sin (\pi+\alpha))$ बिंदुओं की दिशाएँ क्या हैं?

यदि $\sin \left( x + \frac{4\pi}{9} \right) = a$ और $\frac{\pi}{9} < x < \frac{\pi}{3}$ है,तो $\cos \left( x + \frac{7\pi}{9} \right)$ का मान ज्ञात कीजिए:

$\sin 50^\circ - \sin 70^\circ + \sin 10^\circ = $

त्रिकोणमितीय फलन $\sin \left(-\frac{11 \pi}{3}\right)$ का मान ज्ञात कीजिए।

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