Hi, I am new to this forum. Greetings to everyone. I'm kind of stuck in Pset7 problem 3b. It's about finding the centroid of an isosceles triangle for any angle theta between the equal sides. The method I'm trying is to use polar coordinates and I split the triangle through its height line and compute firstly the outer integrals from 0 to theta/2 and then from theta to theta/2 and then add them up together. I set the limits of the inner integral from 0 to R*cos(theta/2), where R is the length of the equal sides. After computing this it gives something like cos^4(theta/2)*sin(theta/2) which I'd

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