Changes

:<math>\frac{f(x+h)-f(x)}{h}</math>.

:<math>\frac{f(x+h)-f(x)}{h}</math>.

Therefor the gradient of the line that meet (is tangential to) <math>f(x)</math> at <math>x</math> is the limit as <math>h</math> tend to zero, or,

Therefor the gradient of the line that meet (is tangential to) <math>f(x)</math> at <math>x</math> is the limit as <math>h</math> tends to zero, or,

:<math>\lim_{h\rightarrow0}\frac{f(x+h)-f(x)}{h},</math>

:<math>\lim_{h\rightarrow0}\frac{f(x+h)-f(x)}{h},</math>