pi --*cos(x) 4
(pi/4)*cos(x)
The derivative of a constant times a function is the constant times the derivative of the function.
The derivative of cosine is negative sine:
So, the result is: −πsin(x)4- \frac{\pi \sin{\left(x \right)}}{4}−4πsin(x)
The answer is:
-pi*sin(x) ----------- 4
-pi*cos(x) ----------- 4
pi*sin(x) --------- 4