Question: Use the formula c o s ( a u ) c o s ( b u ) d u = s i n ( (

Use the formula
cos(au)cos(bu)du=sin((a-b)u)2(a-b)+sin((a+b)u)2(a+b)+C
to evaluate the following integral.
02cos(6x)cos(3x)dx
Use the formula c o s ( a u ) c o s ( b u ) d u =

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