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Câu hỏi: Trong các khẳng định sau, khẳng định nào sai?
A. $\int{\dfrac{1}{x}\text{d}x}=\ln \left| x \right|+C$.
B. $\int{{{x}^{e}}\text{d}x}=\dfrac{{{x}^{e+1}}}{e+1}+C$.
C. $\int{{{e}^{x}}\text{d}x}=\dfrac{{{e}^{x+1}}}{x+1}+C$.
D. $\int{\cos 2x\text{d}x}=\dfrac{1}{2}\sin 2x+C$.
A. $\int{\dfrac{1}{x}\text{d}x}=\ln \left| x \right|+C$.
B. $\int{{{x}^{e}}\text{d}x}=\dfrac{{{x}^{e+1}}}{e+1}+C$.
C. $\int{{{e}^{x}}\text{d}x}=\dfrac{{{e}^{x+1}}}{x+1}+C$.
D. $\int{\cos 2x\text{d}x}=\dfrac{1}{2}\sin 2x+C$.
$\int{{{e}^{x}}\text{d}x}=\dfrac{{{e}^{x+1}}}{x+1}+C$ sai vì $\int{{{e}^{x}}\text{d}x}={{e}^{x}}+C$.
Đáp án C.