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## Homework Statement

[tex]\int[/tex] sin(2x)dx

## Homework Equations

I know the integral of sin(x)dx = -cos(x) + C

## The Attempt at a Solution

What I did was to say that the integral is -cos(2x) +C, which isn't the correct answer...I should have gotten -1/2(cos(2x)) +C. I can see that this is the correct answer when I differentiate it via chain rule and get sin(2x), however I can't seem to integrate the problem to get the right answer. Can someone walk me through it please.....