Hi

i need help in solving this integral for this specific integration limit:

int (0) to (pi/2) {cos (2 theta)/(cos(theta)-x)}dtheta abs (x)<1

Appreciate your help

mopen

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- Oct 18th 2011, 10:37 PMmopenDefinite integral using contour integration.
Hi

i need help in solving this integral for this specific integration limit:

int (0) to (pi/2) {cos (2 theta)/(cos(theta)-x)}dtheta abs (x)<1

Appreciate your help

mopen - Oct 18th 2011, 11:01 PMFernandoRevillaRe: i need help solving this integral.
If the problem has been proposed in the context of complex variable, use the substitution $\displaystyle z=e^{i\theta}$ .

- Oct 18th 2011, 11:23 PMmopenRe: i need help solving this integral.
yes, i did that but the problem is that i got imaginary part of the solution, but i think the integral should be real.

- Oct 19th 2011, 12:29 AMFernandoRevillaRe: i need help solving this integral.
- Oct 19th 2011, 09:21 AMmopenRe: Definite integral using contour integration.
Hi

i have attached two different solution for the problem. from the first one i got unexpected results at low x and at the second one i got imaginary part of the solution.

So any help with the problem!

thanks

mopen