(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

[tex]\int cos(1/2)x = 2sin(x/2) + c[/tex] ==> Correct Answer

This is an answer to one of my homework problems, but I don't understand why the indefinite integtral of cos(1/2)x is that. I've learned u-substitution and the power rule, but using those methods, I got:

2. The attempt at a solution

[tex] u = .5x, du = .5dx \int cos(u)du = sin(u)+c = sin(.5x)+c[/tex] (wrong answer?)

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# U-substitution integration help

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