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Clearnote
Q&A
Senior High
Mathematics
(g〇f)(x)って何を表してます?
Mathematics
Senior High
almost 4 yearsago
どら
(g〇f)(x)って何を表してます?
指針 294 〈定積分の等式と回転体の体積〉 (1) g(y)=g(f(x)) = (gof) (x)=xが成り立つ。 (②2) Sexf(x)dx=[(f(x) f(x)dxと計算できる。 a (1) y=f(x) より dy=f'(x)dx また g(y)=g(f(x)) = (gof) (x)=x よって (2) Sx²f'(x) dx = [x²/(x)]-[2xf(x) dx a S{g(y)}² dy = Sx² f'(x) dx a = b2f(b)-a²f(a)2$exf(x)dx a =b²d-a³c-2°xf(x) dx (3) f(x)=1 とおくと,関数 y=f(x) xex は逆関数をもち,それを x=g(y) とする。 また ƒ(1) = 1, ƒ(2) = 1 e' 2e2 求める体積をVとすると YA 1 e 1 y CIG a y=f(x) E
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