यदि $A, B, C$ एक त्रिभुज के कोण हैं,तो $\sin^2 A + \sin^2 B + \sin^2 C - 2\cos A \cos B \cos C = $

  • A
    $1$
  • B
    $2$
  • C
    $3$
  • D
    $4$

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