Use integration by parts to calculate = f e^(ax) cos for ≠ 0 and ≠ 0.
This is my working so far. The part where i have to integrate is confusing so with some help maybe i can do it .
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See https://math.stackexchange.com/questions/1502055/integration-of-eax-cos-bx-and-eax-sin-bx – lab bhattacharjee Sep 28 '17 at 05:46
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so is there like 2 possible answers ? I am so sorry but i am trying to follow the method taught by our school and it will be great if u can tell me how to work on the second part – Joseph Matt Sep 28 '17 at 05:50
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For example, the derivative of $e^{ax}$ is $ae^{ax}$, not $e^{ax}$. Similarly your integral of $\cos(bx)$ is wrong. – GEdgar Sep 28 '17 at 11:21