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Evaluate: lim(x->a)(logx-loga)/(x-a)...

Evaluate: `lim_(x->a)(logx-loga)/(x-a)`

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`lim_(x to a)(logx-loga)/(x-a)`
`=lim_(x to a)(log(x/a))/(a(x/a-1))`
`=lim_(x to a)(log(1+(x/a-1)))/(a(x/a-1))`
Take `y= x/a-1`
`=lim_(y to 0)((log(1+y))/(a xx y))`
`=1/a xx 1`
`=1/a`
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