Differentiate w.r.t. x
1600x^{63}
Evaluate
25x^{64}
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64\times 25x^{64-1}
The derivative of ax^{n} is nax^{n-1}.
1600x^{64-1}
Multiply 64 times 25.
1600x^{63}
Subtract 1 from 64.
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