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gunakan rumus integral parsial
= u×v -
dengan u=3x; du=3; dv=cos 2x; v= sin 2x
= 3x × sin 2x -
= x sin 2x - ( )
= x sin 2x - ( × cos 2x)
= x sin 2x - ( cos 2x)
= x sin 2x + cos 2x + c