यदि $\sin \alpha = \sin \beta$ और $\cos \alpha = \cos \beta$ है,तो किसी पूर्णांक $n$ के लिए $\alpha - \beta = $ क्या होगा?

  • A
    $n \pi$
  • B
    $2 n \pi + \frac{\pi}{2}$
  • C
    $2 n \pi - \frac{\pi}{2}$
  • D
    $2 n \pi$

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यदि $x = a \cos^3 \theta$ और $y = b \sin^3 \theta$ है,तो:

$\cos^2 \frac{\pi}{12} + \cos^2 \frac{\pi}{4} + \cos^2 \frac{5\pi}{12}$ का मान ज्ञात कीजिए।

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योगफल ज्ञात कीजिए: $\sin^2(3^{\circ}) + \sin^2(6^{\circ}) + \sin^2(9^{\circ}) + \dots + \sin^2(84^{\circ}) + \sin^2(87^{\circ}) + \sin^2(90^{\circ})$

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