$ABC$ एक ऐसा त्रिभुज है कि $\sin(2A + B) = \sin(C - A) = -\sin(B + 2C) = \frac{1}{2}$ है। यदि $A, B,$ और $C$ $A.P.$ में हैं,तो $A, B,$ और $C$ हैं:

  • A
    $30^o, 60^o, 90^o$
  • B
    $45^o, 60^o, 75^o$
  • C
    $45^o, 45^o, 90^o$
  • D
    $60^o, 60^o, 60^o$

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$\frac{1}{\sin 1^{\circ} \sin 2^{\circ}}+\frac{1}{\sin 2^{\circ} \sin 3^{\circ}}+\ldots+\frac{1}{\sin 89^{\circ} \sin 90^{\circ}} = $

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