Tính đạo hàm của mỗi hàm số sau trên khoảng xác định của nó
a) $y = x \ln x $;                                                             b) $y = \ln (x^2 + x + 1)$
c) $y = \log_2 (x^2 +e^x)$;                                              d) $y = \ln \sqrt{ x^2 + 2008} $
a) $y' = x'\ln x + (\ln x)'x = \ln x + \frac{1}{x}. x = \ln x + 1 $

b) $y' = \frac{(x^2 +x+1)'}{x^2+x+1} = \frac{2x+1}{x^2+x+1}  $

c) $y' = \frac{(x^2+e^x)'}{(x^2+e^x) \ln 2} = \frac{2x +e^x}{(x^2+e^x) \ln 2}  $

d) $y' = \frac{(\sqrt{x^2 +2008 } )' }{\sqrt{ x^2 +2008} } = \frac{(x^2 + 2008)'}{2\sqrt{ x^2 +2008} } . \frac{1}{\sqrt{x^2 +2008 } } = \frac{x}{x^2 + 2008}    $

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