Intergration questions!! Watch

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sb1986
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Integrate 2sin3xsin2x dx

In the answers it says its the equivilent of integrating (cosx-cos5x) but I dont know how to change it! Please help.

Also I know that when integrating products u use integration by parts but how do u know when to use substitution? Im doing C4.

Thanks
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Gaz031
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(Original post by sb1986)
Integrate 2sin3xsin2x dx

In the answers it says its the equivilent of integrating (cosx-cos5x) but I dont know how to change it! Please help.

Also I know that when integrating products u use integration by parts but how do u know when to use substitution? Im doing C4.

Thanks
Use cos(A-B)-Cos(A+b)=2sinAsinB
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