$\int secutanudu$ $u=5x$
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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