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与式
=[-2→2]∫(x²+4)dxー[-2→2]∫4x dx
ここで、f(x)が偶関数のとき[-a→a]∫f(x)dx=2[0→a]∫f(x)dx
f(x)が奇関数のとき[-a→a]∫f(x)dx=0 だから
[-2→2]∫(x²+4)dxー[-2→2]∫4x dx=2[0→2]∫(x²+4)dxー0

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