设f(x)=f(x一π)+sinx,且当x∈[0,π]时,f(x)=x,求∫π3πf(x)dx.

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问题 设f(x)=f(x一π)+sinx,且当x∈[0,π]时,f(x)=x,求∫πf(x)dx.

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答案πf(x)dx=∫πx[f(x一π)+sinx]dx=∫πf(x一π)dx+∫πsinxdx =∫πf(x)dx=∫0πxdx+∫πf(x)dx=[*]+∫π[f(x一π)+sinx]dx =[*]+∫πf(x一π)dx+∫πsinxdx=[*]+∫0πxdx一2=π2—2.

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