(iii) f(x)=x2+x2−1=2x2−1f(x) = x^2 + x^2 - 1 = 2x^2 - 1f(x)=x2+x2−1=2x2−1 Find and simplify: f(a+h)−f(a)h\frac{f(a+h) - f(a)}{h}hf(a+h)−f(a)