यदि $x$ और $y$ न्यून कोण हैं,जहाँ $\cos x + \cos y = \frac{3}{2}$ और $\sin x + \sin y = \frac{3}{4}$ है,तो $\sin(x + y)$ का मान ज्ञात कीजिए।

  • A
    $\frac{2}{5}$
  • B
    $\frac{3}{4}$
  • C
    $\frac{3}{5}$
  • D
    $\frac{4}{5}$

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$\tan 1^{\circ}, \tan 2^{\circ}, \ldots, \tan 89^{\circ}$ का गुणोत्तर माध्य (geometric mean) है

$\sin ^2 5^{\circ}+\sin ^2 10^{\circ}+\sin ^2 15^{\circ}+\ldots+\sin ^2 90^{\circ}$ का मान ज्ञात कीजिए।

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