Write a value


Write a value of $\int \cos ^{4} x \sin x d x$


let $\cos x=t$

Differentiating on both sides we get,

$-\sin x d x=d t$

Substituting above equation in $\int \cos ^{4} x \sin x d x$ we get,

$=\int-t^{4} d t$


$=-\frac{\cos ^{5} x}{5}+c$

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