intg (e^2x+1)/e^x dx
Let t = e^x
==> dt = e^x dx = tdx ==> dx = dt/t
==> intg (e^2x+ 1)/e^x) dx = intg (t^2 + 1)/t * dt/t
= intg (t^2 + 1)/t^2 dt
= intg (1 + 1/t^2) dt
= intg (1+ t^-2) dt
= t - t^-1 + c
= e^x - e^-x + c
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