I don't get the step in the red box. But.. here's what I have:
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Hi, Substitute t=x^2+5, it should help you see the red step. and what you did is wrong o.O
Originally Posted by Moo Hi, Substitute t=x^2+5, it should help you see the red step. and what you did is wrong o.O I did that but I still don't know what to do... How do I cancel the "x"s if there's an addition at the denominator ??
Originally Posted by Macleef I did that but I still don't know what to do... How do I cancel the "x"s if there's an addition at the denominator ?? What is the derivative of x^2+5 with respect to x ?? What is the derivative of a constant ? du is not (2x+5) dx. I'm sorry, I'll let you search for your mistake, I won't tell you the solution
wow... I've been doing so much differentiation that I almost forgot all basic rules of derivatives. Thank you!
Originally Posted by Macleef wow... I've been doing so much differentiation that I almost forgot all basic rules of derivatives. Thank you! That's less scary !
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