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Evaluate the integral: `int sin(9x)*e^cos(9x)dx`
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The integral `int (sin 9x)*e^(cos 9x) dx` has to be evaluated.
`int (sin 9x)*e^(cos 9x) dx`
let cos 9x = y
`(-1/9)*dy = sin 9x dx`
=> `int (-1/9) e^y dy`
substitute y = cos 9x
=>` -e^(cos 9x)/9`
The required integral is `-e^(cos 9x)/9 + C`
Posted by justaguide on March 23, 2012 at 2:43 PM (Answer #1)
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