若函数f(x)f(x)f(x)在区间[1,3][1,3][1,3]上连续,并且在该区间上的平均值是6,则∫13f(x)dx=12\int_{1}^{3}f(x)dx = 12∫13f(x)dx=12.( )
设函数f(x)=sinxf(x)=\sin xf(x)=sinx,g(x)=2+x2g(x)=2 + x^{2}g(x)=2+x2,则复合函数g[f(x)]=g[f(x)]=g[f(x)]=( ).
极限limx→01+2x2−1cosx−1=\lim\limits_{x\rightarrow0}\dfrac{\sqrt{1 + 2x^{2}}-1}{\cos x - 1}=x→0limcosx−11+2x2−1=( ).
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