How do you find the fourth derivative of $cos x$ ?

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Answer 1 · 2017-01-04T04:56:18

$cosx$

$d/(dx)cosx=-sinx$

$d/(dx)(-sinx)=-cosx$

$d/(dx)(-cosx)=sinx$

$d/(dx)(sinx)=cosx$

The fourth derivative of $cosx$ is $cosx$ .

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