( F(z)=log₁₀(1+z²) ):
a) ( F'(z) = 2z/1+z²ln(10) )
b) ( F'(z) = 2z/1+z²log₁₀(10) )
c) ( F'(z) = 2z/1+z²log₁₀(e) )
d) ( F'(z) = 2z/1+z²ln(1) )