問題 1. 次の関数 f(x,y) の偏導関数 fz, fy をそれぞれ求めよ.
(1) f(x, y) = xy + x + 2y − 1
(3) f(x, y) = (x+2y5) ¹00
(5) f(x, y) = sin (xy)
(7) f(x,y) = ezy®
(9) f(x, y) = log
X
Y
(2) f(x, y) = 2x³y - 4xy³
(4) f(x, y) = √xy
(6) f(x, y) = cos (x² - 3y)
(8) f(x, y) = e² sin (3x - y)
(10) f(x, y) = xy log (x² + 2y)