यदि $3 \sin xy + 4 \cos xy = 5$ है,तो $\frac{dy}{dx}$ का मान . . . . . . होगा।

  • A
    $\frac{3 \sin xy + 4 \cos xy}{3 \cos xy - 4 \sin xy}$
  • B
    $\frac{3 \cos xy + 4 \sin xy}{4 \cos xy - 3 \sin xy}$
  • C
    $\frac{-y}{x}$
  • D
    $\frac{x}{y}$

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