How to Integrate 1 Cos 2x?

2

(int cos(2x),dx)

Let (u=2x)

Then (du=2,dx), so (dx=frac{1}{2}du)

(int cos(2x),dx=frac{1}{2}int cos(u),du)

(frac{1}{2}sin(u)+C)

(frac{1}{2}sin(2x)+C)

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