integral from 0 to t of (t-w)e^{4w}

解

\int_{0}^{t} (t - w) e^{4 w} d w

\frac{t ( e ^{4 t} - 1 )}{4} - \frac{1}{16} (4 t e^{4 t} - e^{4 t} + 1)

解答ステップ

\int_{0}^{t} (t - w) e^{4 w} d w

拡張

(t - w) e^{4 w} : t e^{4 w} - e^{4 w} w

= \int_{0}^{t} t e^{4 w} - e^{4 w} w d w

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_{0}^{t} t e^{4 w} d w - \int_{0}^{t} e^{4 w} w d w

\int_{0}^{t} t e^{4 w} d w = \frac{t ( e ^{4 t} - 1 )}{4}

\int_{0}^{t} e^{4 w} w d w = \frac{1}{16} (4 t e^{4 t} - e^{4 t} + 1)

= \frac{t ( e ^{4 t} - 1 )}{4} - \frac{1}{16} (4 t e^{4 t} - e^{4 t} + 1)