Definite Integration

\({I_1} = \int\limits_0^1 {{e^{ - x}}{{\cos }^2}x\,dx}\), \({I_2} = \int\limits_0^1 {{e^{ - {x^2}}}{{\cos }^2}x\,dx}\), \({I_3} = \int\limits_0^1 {{e^{ - {x^2}}}dx}\), \({I_4} = \int\limits_0^1 {{e^{ - {x^2}/2}}dx}\) দেওয়া আছে। এদের মধ্যে বৃহত্তম I হলে