Find the derivative of cos 2x

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Eric Eskildsen asked Mar 12, 2023

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Find the derivative of cos 2x

Mathematics
college

Eric Eskildsen asked Mar 12, 2023

by Eric Eskildsen

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1 Answer

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Answer:

2sin2x

Explanation:

let u= 2x

du/dx =2

y=cos2x

y=cosu

dy/du =sinu

dy/dx =dy/du × du/dx

dy/dx = sinu × 2

dy/dx =2sinu

but, u=2x

hence dy/dx = 2sin2x

Fabiano answered Mar 16, 2023

by Fabiano

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1 Answer

2sin2x

let u= 2x

du/dx =2

y=cos2x

y=cosu

dy/du =sinu

dy/dx =dy/du × du/dx

dy/dx = sinu × 2

dy/dx =2sinu

but, u=2x

hence dy/dx = 2sin2x

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