Evaluate
17y^{2}+18xy-12x^{2}
Differentiate w.r.t. x
18y-24x
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-12x^{2}+6y^{2}+18xy+11y^{2}
Combine -3x^{2} and -9x^{2} to get -12x^{2}.
-12x^{2}+17y^{2}+18xy
Combine 6y^{2} and 11y^{2} to get 17y^{2}.
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Limits
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