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i have to integrate using u substitution, but i am not sure if i did it correct.

�çtan^3(5x)sec^2(5x)dx
u=5x
du=5dx
1/5du=dx

1/5�çtan^3(u)sec^2(u)du
1/5tanusec^2u+c
1/5tan(5x)sec^2(5x)+c

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