Help please :) int(x^2+1) cos x dx?

I got (x^2+1) sin x + 2x cos x + 2 sin x + c but I don't think that's the correct answer, using integral calculator it shows (x^2-1) sin x + 2x cos x +c. but I don't know how

asked Jul 9, 2014 in PRECALCULUS by jideyiyun Rookie

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Help please :) int(x^2+1) cos x dx?

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