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Posted by **RuggedChild** on Tuesday, February 24, 2009 at 2:41pm.

Integral of: 4x(tan(x^2))dx

Integral of: (1/(sqrt(x)*x^(sqrt(x))))dx

Integral of: (cos(lnx)/x)dx

- Calculus II (#3 of 3) -
**drwls**, Tuesday, February 24, 2009 at 4:10pmIntegral of: (cos(lnx)/x)dx

let u = ln x

du = dx/x

Your integral is therefore that of

cos u du, which is sin u = sin(ln x)

Try the others yourself. In the first one, I would let x^2 = u

- Calculus II -
**Anonymous**, Monday, May 2, 2011 at 3:49pmIntegral 3x/x2(x-2)dx

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