જો $y = (ax + b) \cos x$ હોય,તો $y_2 + y_1 \sin 2x + y(1 + \sin^2 x) = $

  • A
    $0$
  • B
    $2a \sin x$
  • C
    $-2a \sin x$
  • D
    $ax + b$

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