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人気のある微分積分 >

integral of sqrt(4x^2+9)

解

\int 4 x^{2} + 9 d x

解

\frac{1}{4} (2 x 4 x^{2} + 9 + 9 ln (\frac{2 x + 4 x ^{2} + 9}{3})) + C

解答ステップ

\int 4 x^{2} + 9 d x

三角関数による置換を適用する

= \int \frac{9}{2} sec^{3} (u) d u

定数を除く:

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

= \frac{9}{2} \cdot \int sec^{3} (u) d u

積分換算を適用する

= \frac{9}{2} (\frac{sec ^{2} ( u ) sin ( u )}{2} + \frac{1}{2} \cdot \int sec (u) d u)

\int sec (u) d u = ln ∣ tan (u) + sec (u) ∣

= \frac{9}{2} (\frac{sec ^{2} ( u ) sin ( u )}{2} + \frac{1}{2} ln ∣ tan (u) + sec (u) ∣)

代用を戻す

u = arctan (\frac{2}{3} x)

= \frac{9}{2} (\frac{sec ^{2} ( arctan ( \frac{2}{3} x ) ) sin ( arctan ( \frac{2}{3} x ) )}{2} + \frac{1}{2} ln tan (arctan (\frac{2}{3} x)) + sec (arctan (\frac{2}{3} x)))

簡素化

\frac{9}{2} (\frac{sec ^{2} ( arctan ( \frac{2}{3} x ) ) sin ( arctan ( \frac{2}{3} x ) )}{2} + \frac{1}{2} ln tan (arctan (\frac{2}{3} x)) + sec (arctan (\frac{2}{3} x))) : \frac{1}{4} (2 x 4 x^{2} + 9 + 9 ln (\frac{2 x + 4 x ^{2} + 9}{3}))

= \frac{1}{4} (2 x 4 x^{2} + 9 + 9 ln (\frac{2 x + 4 x ^{2} + 9}{3}))

定数を解答に追加する

= \frac{1}{4} (2 x 4 x^{2} + 9 + 9 ln (\frac{2 x + 4 x ^{2} + 9}{3})) + C

グラフ

人気の例

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