Evaluate
2x^{2}-43\sqrt{77}
Differentiate w.r.t. x
4x
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x^{2}-43\sqrt{77}-x^{2}+2x^{2}
Add 5 and 72 to get 77.
-43\sqrt{77}+2x^{2}
Combine x^{2} and -x^{2} to get 0.
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