Logarithmic differentiation

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Find the derivative of the following function:y=(ab)x⋅(bx)a⋅(xa)b (a>0,b>0)y=\left(\dfrac {a}{b}\right)^{x} \cdot \left(\dfrac {b}{x}\right)^{a} \cdot \left(\dfrac {x}{a}\right)^{b} \ (a>0, b>0).

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Find the derivative of the following function:y=x+xx+xxx (x>0)y=x+x^{x}+x^{x^{x}} \ (x>0).

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Find the derivative of the following function:y=xxa+xax+axx (a>0,x>0)y=x^{x^{a}}+x^{a^{x}}+a^{x^{x}} \ (a>0, x>0).

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Find the derivative of the following function:y=xx(x>0)y=\sqrt[x]{x} \quad (x>0).

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Find the derivative of the following function:y=(sin⁡x)cos⁡x+(cos⁡x)sin⁡xy=(\sin x)^{\cos x}+(\cos x)^{\sin x}.

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Find the derivative of the following function:y=(ln⁡x)x÷xln⁡xy=(\ln x)^{x} \div x^{\ln x}.

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The derivative obtained from the logarithm of a known function is called the logarithmic derivative of that function:

ddxln⁡f(x)=f′(x)f(x). \frac{d}{dx}\ln f(x)=\frac{f'(x)}{f(x)} .

Given the function yy, find its logarithmic derivative:

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(a)

y=x1−x1+xy=x\sqrt{\dfrac {1-x}{1+x}};

(b)

y=x21−x3−x(3+x)23y=\dfrac {x^{2}}{1-x}\sqrt[3]{\dfrac {3-x}{(3+x)^{2}}};

(c)

y=(x−a1)α1(x−a2)α2⋯(x−an)αny=(x-a_{1})^{\alpha_{1}}(x-a_{2})^{\alpha_{2}}\cdots (x-a_{n})^{\alpha_{n}};

(d)

y=(x+1+x2)ny=\left(x+\sqrt{1+x^{2}}\right)^{n}.

Find the derivative of the function y=xxy = x^{x}.

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Find the derivative of the function y=xsin⁡xy = x^{\sin x}.

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Find the derivative of the function. y=xxy = x^{x}.

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Find the derivative of the function. y=x7/ln⁡xy = x^{7 / \ln x}.

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Find the derivative of the function. y=log⁡x7y = \log_{x} 7.

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Find the derivative of the function. y=log⁡2x⋅log⁡xe+log⁡2x⋅ln⁡2y = \log_{2} x \cdot \log_{x} e+\log_{2} x \cdot \ln 2.

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Find the derivative of the function. y=x2/ln⁡x−2xlog⁡xee1+ln⁡x+e1+2/log⁡xey = x^{2 / \ln x}-2 x^{\log_{x} e} e^{1+\ln x}+e^{1+2 / \log_{x} e}.

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Find the derivative of the function. y=xx2y = x^{x^{2}}.

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Find the derivative of the function. y=xexy = x^{e^{x}}.

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Find the derivative of the function. y=2xxy = 2^{x^{x}}.

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Find the derivative of the function. y=xxxy = x^{x^{x}}.

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Find the derivative of the function. y=∣sin⁡x∣cos⁡xy = |\sin x|^{\cos x}.

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Find the derivative of the function. y=(arcsin⁡sin⁡2x)arctg⁡xy = \left(\arcsin \sin^{2} x\right)^{\operatorname {arctg} x}.

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Find the derivative of the function. y=(ch⁡x)exy = (\operatorname {ch} x)^{e^{x}}.

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Compute the derivative of the function at the indicated points. y=(ch⁡x)sh⁡x,x=0y = (\operatorname {ch} x)^{\operatorname {sh} x}, x = 0.

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Compute the derivative of the function at the indicated points. y=(1+3x)ln⁡x2,x=1y = \left(\sqrt{1+3^{x}}\right)^{\ln x^{2}}, x = 1.

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Compute the derivative of the function at the indicated points. y=((sin⁡x)/x)x,x=π/2y = ((\sin x) / x)^{x}, x = \pi / 2.

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Let f(x),x∈Rf(x), x \in \mathbb {R}, and g(x),x∈Rg(x), x \in \mathbb {R}, be everywhere differentiable functions. Find y′(x)y^{\prime }(x) if:

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(1)

y=f2(x)+g2(x)n,f2(x)+g2(x)>0y = \sqrt[n]{f^{2}(x)+g^{2}(x)}, f^{2}(x)+g^{2}(x) > 0

(2)

y=ln⁡∣f(x)/g(x)∣,f(x)g(x)≠0y = \ln \left|f(x) / g(x)\right|, \quad f(x) g(x) \neq 0;

(3)

y=f(sin⁡2x)+g(cos⁡2x)y = f\left(\sin^{2} x\right)+g\left(\cos^{2} x\right);

(4)

y=(f(x))g(x),f(x)>0y = (f(x))^{g(x)}, f(x) > 0.

References

[Dem97] Demidovich B.P. Сборник задач и упражнений по математическому анализу. 13-е изд., Издательство Московского университета / Издательство "ЧеРо", 1997.
[ГюКу03] Гюнтер Н.М., Кузьмин Р.О. Сборник задач по высшей математике. 13-е изд., Издательство «Лань», 2003.
[ККЧ+03] Кудрявцев Л.Д., Кутасов А.Д., Чехлов В.И., Шабунин М.И. Предел. Непрерывность. Дифференцируемость. 2-е изд., ФИЗМАТЛИТ, 2003.