请教各位: 1-cosX 1.∫─── dx 1+sinX 2.Prove that if f and g are continuous on [a,b] and g is nonnegative, a a then there is a number c in (a,b) for which ∫f(x)g(x)dx=f(c)∫g(x)dx. b b 第一题我的想法是上下同乘(1-sinX),但会越来越难代换掉 第二题则完全没头绪,烦请高手给个提示 谢谢 --

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