"f_x'=e^{x+y}\\sin x+e^{x+y}\\cos x+18x+2y" , "f_{xy}''=e^{x+y}\\sin x+e^{x+y}\\cos x+2"
"f_y'=e^{x+y}\\sin x+2x" , "f_{yx}''=""e^{x+y}\\sin x+e^{x+y}\\cos x+2" then
"f_{xy}''=f_{yx}''=e^{x+y}(\\sin x+\\cos x)+2\\approx29.8" at "(x,y)=(1,2)"
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