x E *cos(x)
E^x*cos(x)
Apply the product rule:
; to find :
The derivative of is itself.
The derivative of cosine is negative sine:
The result is:
Now simplify:
The answer is:
x x cos(x)*e - e *sin(x)
x -2*e *sin(x)
x -2*(cos(x) + sin(x))*e