10/x3 = 10 x-3
d/dx(10x-3) = -30 x-4 = -30/x4
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It is x^2 + xy + y^2
21 X squared over 5
1 divided by x to the third power equals x to the negative third. The derivative of x to the negative third is minus three x to the negative fourth.
526
The derivative of 10x is 10. This is irrespective of the value of x.