the question is (y^2)/(25+y^2) dy.
here are my steps:
a=5
y=5tanx
dy=5secx^2 dx
[(5tanx)^2 * 5secx^2]/[25*(1+tanx^2)] dx
= [(5tanx)^2 * 5secx^2]/[25*secx^2] dx
=5tanx^2 dx
im stuck here.
I tried to use integration by parts to solve 5tanx^2 dx. but it didn't work out
The final answer should be y-5arctan(y/5)+C which c is any constant