#integration

Question

$I=\int sin(2x) cos(3x) dx$

1.(5cosx-cos5x)/10

2.(5sinx-sin5x)/10

3.both

4.none

Comments

$I=\frac{1}{2}\int 2sin(2x).cos(3x)dx$

after that what formula do you apply?

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sin(a) + sin(b) = 2sin(a+b/2)cos(a-b/2)

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ok thanks