下限

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ƒ(x)=∫(x→x+π/2)|sint|dtƒ(x+π)=∫(x+π→x+3π/2)|sint|dt令t=y+π,dy=dxƒ(x+π)=∫(x→x+π/2)|sin(y+π)|dy=∫(x→x+π