∫ 1/(5x-2) ^4 dx
= 1/5∫ 1/(5x-2) ^4 d(5x-2)
=-1/5*1/3*[1/(5x-2) ^3]+c
=-1/15*[1/(5x-2) ^3]+c
=-1/15(5x-2) ^3 +c
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