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Question
Find the derivative of 99x at x = 100.
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Solution
`f'(a) = lim_(x → a) (f(a + h) - f(a))/h`
`f'(100) = lim_(h → 0) (99 (100 + h) - 99 xx 100)/h`
= ` lim_(h → 0) (99 xx 100 + 99h - 99 xx 100)/h`
= `= lim_(h → 0)(99 xx h)/h`
= 99
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