[itex]f(x) = \tan(x) = \frac{\sin(x)}{\cos(x)}[/itex](adsbygoogle = window.adsbygoogle || []).push({});

Using: [itex](\Delta x = h)[/itex]

[itex]f'(x) = \frac{f(x + h) - f(x)}{h}[/itex]

[itex]f'(x) = \frac{\frac{\sin(x + h)}{\cos(x + h)} - \frac{sin(x)}{\cos(x)}}{h}[/itex]

Where do I go from here?

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# Derivation of tanx.

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