loadedgun

1. f'(x)=(8-4x)/(x^2-4x+1)^3

f(1)=4/(1^2-4*1+1)^3=-1/2

2. f'(x)=12sin6x

f(pi/12)=12sin(6*pi/12)=12

3. f'(x)=-e^(cosx)*sinx

f(pi/2)=-e^(cospi/2)*sin(pi/2)=-1

4. f'(x)=-4tg2x

f'(pi/8)=-4tg(2*pi/8)=-4

5. f'(x)=-1/(2*)

f(1/2)=-1/2*=-1