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To evaluate the integral of the function, we'll have to use substitution method.
Let cos x = t .
We'll differentiate both sides:
-sin x dx = dt => sin x dx = -dt
`int` (cos x)^4*sin x dx = - `int` t^4 dt
`int` - ` ` t^4 dt = - t^5/5 + C
The indefinite integral of the function is `int` (cos x)^4*sin x dx = -(cos x)^5/5 + C
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