The differentiation of y-cos mx -sin nx

The correct option is A n ·cos #160; #160;mx ·cos nx m ·sin mx ·sin nx ...

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Question

The differentiation of $y = cos m x \cdot sin n x$

n \cdot cos m x \cdot cos n x - m \cdot sin m x \cdot sin n x

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m \cdot cos m x \cdot cos n x - n \cdot sin m x \cdot sin n x

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cos m x \cdot cos n x - sin m x \cdot sin n x

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None of these

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