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人気のある微分積分 >

integral of (x^3+2x)/(x^4+4x^2)

解

\int \frac{x ^{3} + 2 x}{x ^{4} + 4 x ^{2}} d x

解

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

解答ステップ

\int \frac{x ^{3} + 2 x}{x ^{4} + 4 x ^{2}} d x

簡素化

\frac{x ^{3} + 2 x}{x ^{4} + 4 x ^{2}} : \frac{x ^{2} + 2}{x ( x ^{2} + 4 )}

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

拡張

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

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

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

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

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

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

簡素化

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

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

定数を解答に追加する

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

グラフ

人気の例

integral of (2x-3)(4x^2+6x+9)

\int (2 x - 3) (4 x^{2} + 6 x + 9) d x

integral of (x^3)/(sqrt(x^4-4))

\int \frac{x ^{3}}{x ^{4} - 4} d x

integral of 1/((5-2x)^2)

\int \frac{1}{( 5 - 2 x ) ^{2}} d x

integral of b/(sqrt(1-y))

\int \frac{b}{1 - y} d y

integral of 1/(tan^4(x))

\int \frac{1}{tan ^{4} ( x )} d x