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\int x \sqrt{[2sin(x^{2} +1) - sin2(x^{2} +1)] / 2sin(x^{2} +1)+sin2(x^{2} +1)
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#sin2theta=2sin theta cos theta#. #cos2theta=cos^ 2theta-sin^2theta=2cos^2theta-1=1-2sin^2theta# ... How do you find the integral #intx/(sqrt(x^2+x+1))dx# ... How do you integrate #int(-12)/[x^2sqrt(4-x^2)] dx#
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