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Question: integration range or variable must be specified in the second argument, got a(t)

Question:integration range or variable must be specified in the second argument, got a(t)

ComputerUser 535 Maple 2015
October 29 2016
0

int(a(t)*b(t)+2*(diff(a(t), t))*(diff(b(t), t)), a(t));
Error, (in int) integration range or variable must be specified in the second argument, got a(t)
 

do not understand this error message,

how to integrate it?
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