Question: ( s i n ( 3 x ) ) 9 ( c o s ( 3 x ) ) 4 d x = ( s

(sin(3x))9(cos(3x))4dx=(sin(3x))8(cos(3x))4sin(3x)dx=[udu]====dots
Find the substitution u.
u=cos(3x)
u=-3sin(3x)
u=sin(3x)
( s i n ( 3 x ) ) 9 ( c o s ( 3 x ) ) 4 d x = ( s

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