若f(x)在[0,π]上连续,∫(0,π)f(x)cos(x)dx=∫(0,π)f(x)sin(x)dx=0 则存在a,b∈0,π,使得f(a)=f(b)=0证明:若f(x)在[0,π]上连续,且∫(0,π)f(x)cos(x)dx=∫(0,π)f(x)sin(x)dx=0则存在0
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