Determine whether the integral is divergent or convergent. If it is convergent, evaluate it. If not, state your answer as "DNE"
∫
0
∞
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d
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\displaystyle {\int_{{{0}}}^{{\infty}}}{2}{e}^{{-{x}}}{\left.{d}{x}\right.}
∫
0
∞
2
e
−
x
d
x
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\displaystyle
Enter your answer as a number (like 5, -3, 2.2172) or as a calculation (like 5/3, 2^3, 5+4)
Enter DNE for Does Not Exist, oo for Infinity