[問題] 高斯機率積分
想請問關於高斯積分得證明推導
積 e^(-u(x^2)) dx = 根號(pi/u)
積 e^(-u(x^2)) x^4 = 3/8 * 根號(pi/(u^5))
想請問各位這是怎麼得來的
拜託
(急需)
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