यदि $a \sin \theta = b \cos \theta$,जहाँ $a, b \neq 0$,तो $a \cos 2 \theta + b \sin 2 \theta = $

  • A
    $ab$
  • B
    $a$
  • C
    $b$
  • D
    $\frac{a}{b}$

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