3. 다음 함수 /에 대하여 /w, /w 를 각각 구하고 비교하 여라. (1) f(x, y) = sin' xcosy (2) S(x, y) = 2x²+5xy+ y² %3D (3) S(x, y) = (4) S6, y) = †- xy tan (x+ y) %3D X-y

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