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Compute the derivative of tan x....

Compute the derivative of tan x.

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`f'(x) = lim_(h->0) (f(n+h)-f(h))/h `
`= lim_(h->0) (tan(n+h) - tanh)/h`
`= lim_(h->0) 1/h(sin(x+h)/cos(x+h) - sin h/ cos h)`
`= lim_(h->0) 1/h [ sin(n+h)cosx - sinx.cos(n+h)]/(cos(x+h)cos x)`
`= lim_(h->0) 1/a (sin(x+h-x)/(cos(x+h)cosx))`
`=lim_(h->0) sin h/h*1/(cos(x+h)cosx)`
`= 1/(cos^2x `
`= sec^2x`
...
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