方法如下，
请作参考：
求∫e^(- x) dx与∫e^(- y) dy
The integral of e^(-x) dx is equal to -e^(-x) C and the integral of e^(-y) dy is equal to -e^(-y) C. Therefore, the integrals of e^(-x) dx and e^(-y) dy are both equal to -e^(-x) C and -e^(-y) C, respectively.
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