kinda frustrated with these, how would i go about solving this problem? Thank you.
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Integrate with respect to y, substitute the terminals then do the same for x.
You mean just evaluate it? These are simple polynomials. $\displaystyle \int 4x^{3} - 9x^{2}y^{2}\;dy\;=\;4x^{3}y - 3x^{2}y^{3} + C$ When working on "dy", just treat 'x' like a constant.
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