Evaluate
-128rq^{2}
Differentiate w.r.t. r
-128q^{2}
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0r-0\times 8qr-128q^{2}r
Multiply 0 and 6 to get 0.
0-0\times 8qr-128q^{2}r
Anything times zero gives zero.
0-0qr-128q^{2}r
Multiply 0 and 8 to get 0.
0-0-128q^{2}r
Anything times zero gives zero.
0-128q^{2}r
Subtracting 0 from itself leaves 0.
-128q^{2}r
Anything plus zero gives itself.
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