Apply the product rule:
; to find :
The derivative of a constant times a function is the constant times the derivative of the function.
The derivative of a constant times a function is the constant times the derivative of the function.
Apply the power rule: goes to
So, the result is:
So, the result is:
; to find :
Apply the power rule: goes to
The result is:
Now simplify:
The answer is:
x*cos(E)*c + c*x*cos(E)