Evaluate
48xy_{2}-72y-64y_{3}+81
Differentiate w.r.t. x
48y_{2}
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81-36\times 2y+48xy_{2}-64y_{3}
Multiply 27 and 3 to get 81.
81-72y+48xy_{2}-64y_{3}
Multiply 36 and 2 to get 72.
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