What is the derivative of function f (x) = lgx

What is the derivative of function f (x) = lgx


f'(x)=1/(xlne)



Let f (x) = lgx, then f (2) + F (5) is equal to


f(2)+f(5)=lg2+lg5=lg10=1



If f (lgx) = 1 / x, then f (1) is equal to?
I'm in a hurry


Let lgx = t
Same as x = 10 ^ t
So f (T) = 1 / 10 ^ t
f(1)=1/10



How many zeros does the function f (x) = x -- lgx have


1

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