Answer
$\int secutanudu$
$u=5x$
Work Step by Step
Try it:
$u=5x$
$du=5dx$
$\int secutanudu=secu+C$
$\frac 1 5 \int sec5xtan5x(5xdx)$
$\frac 1 5 \int secutanudu$
$\frac 1 5 (secu+C)$
$\frac 1 5 sec5x+C$
$\int secutanudu$
$u=5x$
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