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人気のある微分積分 >

integral of sin^4(x/2)

解

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

解

2 (- \frac{1}{4} sin^{3} (\frac{x}{2}) cos (\frac{x}{2}) + \frac{3}{16} (x - sin (x))) + C

解答ステップ

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

u置換積分法を適用する

= \int sin^{4} (u) \cdot 2 d u

定数を除く:

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

= 2 \cdot \int sin^{4} (u) d u

積分換算を適用する

= 2 (- \frac{cos ( u ) sin ^{3} ( u )}{4} + \frac{3}{4} \cdot \int sin^{2} (u) d u)

\int sin^{2} (u) d u = \frac{1}{2} (u - \frac{1}{2} sin (2 u))

= 2 (- \frac{cos ( u ) sin ^{3} ( u )}{4} + \frac{3}{4} \cdot \frac{1}{2} (u - \frac{1}{2} sin (2 u)))

代用を戻す

u = \frac{x}{2}

= 2 (- \frac{cos ( \frac{x}{2} ) sin ^{3} ( \frac{x}{2} )}{4} + \frac{3}{4} \cdot \frac{1}{2} (\frac{x}{2} - \frac{1}{2} sin (2 \cdot \frac{x}{2})))

簡素化

2 (- \frac{cos ( \frac{x}{2} ) sin ^{3} ( \frac{x}{2} )}{4} + \frac{3}{4} \cdot \frac{1}{2} (\frac{x}{2} - \frac{1}{2} sin (2 \cdot \frac{x}{2}))) : 2 (- \frac{1}{4} sin^{3} (\frac{x}{2}) cos (\frac{x}{2}) + \frac{3}{16} (x - sin (x)))

= 2 (- \frac{1}{4} sin^{3} (\frac{x}{2}) cos (\frac{x}{2}) + \frac{3}{16} (x - sin (x)))

定数を解答に追加する

= 2 (- \frac{1}{4} sin^{3} (\frac{x}{2}) cos (\frac{x}{2}) + \frac{3}{16} (x - sin (x))) + C

グラフ

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