设f(t)连续并满足f(t)=cos2t+∫0tf(s)sinsds,求f(t).

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问题 设f(t)连续并满足f(t)=cos2t+∫0tf(s)sinsds,求f(t).

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答案因f(t)连续,因此∫0tf(s)sinsds可导,从而f(t)可导,于是[*] 利用公式 f(t)=e∫sintdt[∫一2sin2t.e—∫sintdt+C]. 由f(0)=1得C=e.因此, f(t)=e1—cost+4(cost一1).

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