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→Introduction to derivative
:<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>