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a) Cách 1: y' = (9 -2x)'(2x3- 9x2 +1) +(9 -2x)(2x3- 9x2 +1)' = -2(2x3- 9x2 +1) +(9 -2x)(6x2 -18x) = -16x3 +108x2 -162x -2.
Cách 2: y = -4x4 +36x3 -81x2 -2x +9, do đó
y' = -16x3 +108x2 -162x -2.
b) y' = .(7x -3) +
(7x -3)'=
(7x -3) +7
.
c) y' = (x -2)'√(x2 +1) + (x -2)(√x2 +1)' = √(x2 +1) + (x -2) = √(x2 +1) + (x -2)
= √(x2 +1) +
=
.
d) y' = 2tanx.(tanx)' - (x2)' =
.
e) y' = sin
=
sin
.
a/ \(y'=\frac{\left(2x^2-5x+2\right)'}{2\sqrt{2x^2-5x+2}}=\frac{4x-5}{2\sqrt{2x^2-5x+2}}\)
b/ \(y'=\frac{\left(x+\sqrt{x}\right)'}{2\sqrt{x+\sqrt{x}}}=\frac{1+\frac{1}{2\sqrt{x}}}{2\sqrt{x+\sqrt{x}}}=\frac{2\sqrt{x}+1}{4\sqrt{x^2+x\sqrt{x}}}\)
c/ \(y'=\sqrt{x^2+3}+\left(x-2\right).\frac{\left(x^2+3\right)'}{2\sqrt{x^2+3}}=\frac{2x^2-2x+3}{\sqrt{x^2+3}}\)
d/ \(y'=3\left(1+\sqrt{1-2x}\right)^2.\left(1+\sqrt{1-2x}\right)'=\frac{-3\left(1+\sqrt{1-2x}\right)^2}{\sqrt{1-2x}}\)
e/ \(y'=\frac{1}{2}\sqrt{\frac{x-1}{x^3}}\left(\frac{x^3}{x-1}\right)'=\frac{1}{2}\sqrt{\frac{x-1}{x^3}}\left(\frac{x^2\left(x-1\right)-x^3}{\left(x-1\right)^2}\right)=\frac{-x^2}{2\left(x-1\right)^2}\sqrt{\frac{x-1}{x^3}}\)
f/ \(y'=\frac{4\sqrt{x^2+2}-\left(4x+1\right)\left(\sqrt{x^2+2}\right)'}{x^2+2}=\frac{4\sqrt{x^2+2}-\left(4x+1\right).\frac{x}{\sqrt{x^2+2}}}{x^2+2}\)
\(=\frac{4\left(x^2+2\right)-\left(4x^2+x\right)}{\left(x^2+2\right)\sqrt{x^2+2}}=\frac{8-x}{\left(x^2+2\right)\sqrt{x^2+2}}\)
a : \(y=\dfrac{1}{\left(x^2-x+1\right)^5}=\left(x^2-x+1\right)^{-5}\)
\(\Rightarrow y'=-5\left(2x-1\right)\left(x^2-x+1\right)^{-6}=\dfrac{5-10x}{\left(x^2-x+1\right)^6}\)
b: \(y=x^2+x^{\dfrac{3}{2}}+1\Rightarrow y'=2x+\dfrac{3}{2}x^{\dfrac{1}{2}}=2x+\dfrac{3\sqrt{x}}{2}\)
\(y=\sqrt{\dfrac{x^2+1}{x}}=\left(\dfrac{x^2+1}{x}\right)^{\dfrac{1}{2}}\Rightarrow y'=\dfrac{1}{2}\left(\dfrac{x^2+1}{x}\right)'\left(\dfrac{x^2+1}{x}\right)^{\dfrac{-1}{2}}=\dfrac{x^2-1}{2x^2}\times\dfrac{1}{\sqrt{\dfrac{x^2+1}{x}}}=\dfrac{x^2-1}{2x^2\sqrt{\dfrac{x^2+1}{x}}}\)
\(y'=\dfrac{\left(x+\sqrt{x^2+1}\right)'}{2\sqrt{x+\sqrt{x^2+1}}}=\dfrac{1+\dfrac{x}{\sqrt{x^2+1}}}{2\sqrt{x+\sqrt{x^2+1}}}=\dfrac{x+\sqrt{x^2+1}}{2\sqrt{x^2+1}.\sqrt{x+\sqrt{x^2+1}}}\)
\(=\dfrac{\sqrt{x+\sqrt{x^2+1}}}{2\sqrt{x^2+1}}\)