a)
\(f(x)= \frac{1}{2} •x^{2}-2x+2\)
\(f´(x)= \frac{1}{2} •2x-2=x-2\)
b)
\(f(x)= 4-x^{2}\)
\(f´(x)= -2•x\)
c)
\(f(x)= \frac{1}{2}•x^{3}-2x \)
\(f´(x)= \frac{1}{2}•3•x^{2}-2=\frac{3}{2}•x^{2}-2 \)
d)
\(f(x) = 3x- \frac{1}{3}x^{3}\)
\(f´(x) = 3- \frac{1}{3}•3•x^{2}= 3- x^{2}\)