Well for a start that result needs simplifying; it should be 2*sqrt(arcsin(x)). As for the integral, just make the substitution x = sin(u) and it all drops out nicely:
Is it just me or does this stuff just fall out of your head as soon as you stop using it on a daily basis? I had to do loads of calculus for Electrical & Electronic Engineering BTEC but I can't remember any of it now!
Well for a start that result needs simplifying; it should be 2*sqrt(arcsin(x)). As for the integral, just make the substitution x = sin(u) and it all drops out nicely:
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