Shoutbox

quote:

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Originally posted by s7a5
never did this type of problem b4, and substitution technique doesnt seem to work for it so maybe that's how it goes:
we know that :
(x^2 + 1/x^2)^1/2 = (x + 1/x)
so we are left with:
S (x + 1/x) (x + 1/x)
multiply them we get:
S (x^2 + 2 + x^-2)
so the answer is:

1/3 x^3 + 2x - 1/x


Again Im not sure and didnt look for other ways to solve it, but who knows maybe I'm right

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That's what I done.. (x^2 + 1/x^2) ^ 1/2 != (x+1/x) .

Via parts, I get the following...



I don't think it's right, I cba differentiating it atm, because I'd then have to do something fancy to get it into its original form .

However, I also don't think by parts will work because of the sqrt...