计算∫0xf(t)g(x-t)dt(x≥0),其中,当x≥0时,f(x)=x,而

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问题 计算∫0xf(t)g(x-t)dt(x≥0),其中,当x≥0时,f(x)=x,而

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答案令x=u-t,则g(x)一g(u一t)=[*]于是 [*] ∫0xf(t)g(x—t)dt=∫0xtsin(x—t)dt =∫0xtdcos(x—t)=tcos(x-t)|0x—∫0xcos(x—t)dt =x+sin(x—t)|0x=x—sin x. [*]

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