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`10. y = ln(x^2 + ln(x^2 + 1)) `
`->y' = [(x^2 + ln(x^2 + 1))'] / (x^2 + ln(x^2 + 1))`
`= ((x^2)' + (ln(x^2 + 1))') / (x^2 + ln(x^2 + 1)) `
`= (2x + (1)/(x^2 + 1) . (x^2 + 1)') / (x^2 + ln(x^2 + 1))`
`= (2x + (1)/(x^2 + 1) . 2x) / (x^2 + ln(x^2 + 1)) `
`= (2x + (2x)/(x^2 + 1)) / (x^2 + ln(x^2 + 1)) `
`= ((2x(x^2 + 1))/(x^2 + 1) + (2x)/(x^2 + 1)) / (x^2 + ln(x^2 + 1)) `
`= (2x(x^2 + 1 + 1)/(x^2 + 1)) / (x^2 + ln(x^2 + 1)) `
`= (2x(x^2 + 2))/((x^2 + 1)(x^2 + ln(x^2 + 1)))`
`11. y = sin(e^(x^2) + \sqrt(1 + x^2)) `
`->y' = cos(e^(x^2) + \sqrt(1 + x^2)) . (e^(x^2) + \sqrt(1 + x^2))' `
`= cos(e^(x^2) + \sqrt(1 + x^2)) . ((e^(x^2))' + (\sqrt(1 + x^2))') `
`= cos(e^(x^2) + \sqrt(1 + x^2)) . (2x e^(x^2) + (1)/(2\sqrt(1 + x^2)) . (1 + x^2)')`
`= cos(e^(x^2) + \sqrt(1 + x^2)) . (2x e^(x^2) + (1)/(2\sqrt(1 + x^2)) . 2x) `
`= cos(e^(x^2) + \sqrt(1 + x^2)) . (2x e^(x^2) + x/\sqrt(1 + x^2))`
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EM THAM KHẢO :
10.
$y = \ln(x^2 + \ln(x^2 + 1))$
$y' = \dfrac{(x^2 + \ln(x^2 + 1))'}{x^2 + \ln(x^2 + 1)}$
$= \dfrac{2x + \dfrac{(x^2 + 1)'}{x^2 + 1}}{x^2 + \ln(x^2 + 1)}$
$= \dfrac{2x + \dfrac{2x}{x^2 + 1}}{x^2 + \ln(x^2 + 1)}$
$= \dfrac{\dfrac{2x(x^2 + 1) + 2x}{x^2 + 1}}{x^2 + \ln(x^2 + 1)}$
$= \dfrac{2x^3 + 4x}{(x^2 + 1)(x^2 + \ln(x^2 + 1))}$
$= \dfrac{2x(x^2 + 2)}{(x^2 + 1)(x^2 + \ln(x^2 + 1))}$
11.
$y = \sin(e^{x^2} + \sqrt{1 + x^2})$
$y' = (e^{x^2} + \sqrt{1 + x^2})' \cdot \cos(e^{x^2} + \sqrt{1 + x^2})$
$= \left(2xe^{x^2} + \dfrac{(1 + x^2)'}{2\sqrt{1 + x^2}}\right) \cos(e^{x^2} + \sqrt{1 + x^2})$
$= \left(2xe^{x^2} + \dfrac{2x}{2\sqrt{1 + x^2}}\right) \cos(e^{x^2} + \sqrt{1 + x^2})$
$= \left(2xe^{x^2} + \dfrac{x}{\sqrt{1 + x^2}}\right) \cos(e^{x^2} + \sqrt{1 + x^2})$
$= x\left(2e^{x^2} + \dfrac{1}{\sqrt{1 + x^2}}\right)\cos(e^{x^2} + \sqrt{1 + x^2})$
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