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人気のある微分積分 >

integral of (8(x^2+4))/(x(x^2+8))

解

\int \frac{8 ( x ^{2} + 4 )}{x ( x ^{2} + 8 )} d x

解

8 (\frac{1}{4} ln x^{2} + 8 + \frac{1}{2} ln ∣ x ∣) + C

解答ステップ

\int \frac{8 ( x ^{2} + 4 )}{x ( x ^{2} + 8 )} d x

定数を除く:

\int a \cdot f (x) d x = a \cdot \int f (x) d x

= 8 \cdot \int \frac{x ^{2} + 4}{x ( x ^{2} + 8 )} d x

拡張

\frac{x ^{2} + 4}{x ( x ^{2} + 8 )} : \frac{x ^{2}}{x ( x ^{2} + 8 )} + \frac{4}{x ( x ^{2} + 8 )}

総和規則を適用する:

\int f (x) \pm g (x) d x = \int f (x) d x \pm \int g (x) d x

= 8 (\int \frac{x ^{2}}{x ( x ^{2} + 8 )} d x + \int \frac{4}{x ( x ^{2} + 8 )} d x)

\int \frac{x ^{2}}{x ( x ^{2} + 8 )} d x = \frac{1}{2} ln x^{2} + 8

\int \frac{4}{x ( x ^{2} + 8 )} d x = 4 (\frac{1}{8} ln ∣ x ∣ - \frac{1}{16} ln x^{2} + 8)

= 8 (\frac{1}{2} ln x^{2} + 8 + 4 (\frac{1}{8} ln ∣ x ∣ - \frac{1}{16} ln x^{2} + 8))

拡張

\frac{1}{2} ln x^{2} + 8 + 4 (\frac{1}{8} ln ∣ x ∣ - \frac{1}{16} ln x^{2} + 8) : \frac{1}{4} ln x^{2} + 8 + \frac{1}{2} ln ∣ x ∣

= 8 (\frac{1}{4} ln x^{2} + 8 + \frac{1}{2} ln ∣ x ∣)

定数を解答に追加する

= 8 (\frac{1}{4} ln x^{2} + 8 + \frac{1}{2} ln ∣ x ∣) + C

グラフ

人気の例

derivative of 5x^3+3x^2-4x+1

\frac{d}{d x} (5 x^{3} + 3 x^{2} - 4 x + 1)

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d er i v a t i v e f (x) = \frac{3 x}{x - 3}

(\partial)/(\partial x)(-x(2x-y^3))

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\frac{d}{d x} (\frac{1}{x ^{\frac{1}{2}}})

integral of ((x^2))/(sqrt(81-x^2))

\int \frac{( x ^{2} )}{81 - x ^{2}} d x