Sep 30, 2013 Thread starter #1 paulmdrdo Active member May 13, 2013 386 i don't know how start. please help. $\displaystyle\int xsech^2(x^2)dx$

Sep 30, 2013 #2 ZaidAlyafey Well-known member MHB Math Helper Jan 17, 2013 1,667 Hint : \(\displaystyle \frac{d}{dx} \tanh(x)=\text{sech}^2(x)\) What about \(\displaystyle \frac{d}{dx} \tanh(x^2)\)

Hint : \(\displaystyle \frac{d}{dx} \tanh(x)=\text{sech}^2(x)\) What about \(\displaystyle \frac{d}{dx} \tanh(x^2)\)