The derivative of a constant times a function is the constant times the derivative of the function.
Don't know the steps in finding this derivative.
But the derivative is
So, the result is:
Now simplify:
The answer is:
cos(E)*c*x 3*x *(c*cos(E) + c*cos(E)*log(x))
c*x*cos(E) /1 2 \
3*c*x *|- + c*(1 + log(x)) *cos(E)|*cos(E)
\x /
c*x*cos(E) / 1 2 3 2 3*c*(1 + log(x))*cos(E)\
3*c*x *|- -- + c *(1 + log(x)) *cos (E) + -----------------------|*cos(E)
| 2 x |
\ x /