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人気のある微分積分 >

integral from 60 to 90 of 1/(4+x^2)

解

\int_{60}^{90} \frac{1}{4 + x ^{2}} d x

解

\frac{1}{2} (arctan (45) - arctan (30))

+1

十進法表記

0.00555 \dots

解答ステップ

\int_{60}^{90} \frac{1}{4 + x ^{2}} d x

置換積分法を適用する

= \int_{30}^{45} \frac{1}{2 ( u ^{2} + 1 )} d u

定数を除く:

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

= \frac{1}{2} \cdot \int_{30}^{45} \frac{1}{u ^{2} + 1} d u

共通積分を使用する:

\int \frac{1}{u ^{2} + 1} d u = arctan (u)

= \frac{1}{2} [arctan (u)]_{30}^{45}

限度を計算する:

arctan (45) - arctan (30)

= \frac{1}{2} (arctan (45) - arctan (30))

グラフ

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