バタフライ? 人間、特に動物や（空想科学小説では）エイリアンと区別される人。

I THINK I HAVE INSOMNIA
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Find the directions in which the function increases and decreases most rapidly at upper p 0p0. then find the derivatives of the function in these directions. f(x,y)equals=x squared plus xy plus y squaredx2+xy+y2, upper p 0p0left parenthesis 1 comma negative 4 right parenthesis