Okay I've got another almost similar question but i can't seem to get the answer
integrate x^4 sqrt(1-x^2)

Question

Okay I've got another almost similar question but i can't seem to get the answer 
integrate x^4 sqrt(1-x^2)

anonymous · Answer

there's probably a more elegant method but integration by parts might work

anonymous · Answer

which means? i did it by letting the u = 1-x^2
is that correct?

anonymous · Answer

ah no thahts substitution.
by parts is the reverse of the product rule,

now i look at it it looks like a trig substitution might work

anonymous · Answer

can i do it by substitution? without the trig substitution?

anonymous · Answer

can't use substitution also ea?

anonymous · Answer

then how to eliminate the -2X??

anonymous · Answer

sorry...  thought i had it...

anonymous · Answer

kiki. answer please :)

callisto · Answer

I think trigo. sub. works the best in this case. You can do by substitution, but it's not pleasant to do so, I think,

anonymous · Answer

so @Callisto whats your suggestion?

anonymous · Answer

but still i can't get it. blur how to eliminate the -2x

anonymous · Answer

the other pi suggested it...
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