x^4/4
x^1
4 x -- 4
/ 4\ d |x | --|--| dx\4 /
The derivative of a constant times a function is the constant times the derivative of the function.
Apply the power rule: x4x^{4}x4 goes to 4x34 x^{3}4x3
So, the result is: x3x^{3}x3
The answer is:
3 x
2 3*x
6*x