# Ones that are not obvious 1 f x y sin y 2 f x y x 2 y

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ones that are not obvious.1.f(x,y) =sin(y)2.f(x,y) = (x2-y2)23.f(x,y) =cos(x2+y2)/(1+x2+y2)4.f(x,y) =3-x2-y25.f(x,y) =sin(x)sin(y)e-x2-y26.f(x,y) =1/(1+x2+y2)7.f(x,y) = (x-y)2ABCDECorrect Answers:BDGFAEC5.(1 point) Match the functions with their contour plots la-beled A - G. You may click on the thumbnail image to producea larger image in a new window (sometimes exactly on top ofthe old one).1.f(x,y) =3-x2-y22.f(x,y) =cos(x2+y2)/(1+x2+y2)3.f(x,y) =sin(x)sin(y)e-x2-y24.f(x,y) = (x-y)25.f(x,y) = (x2-y2)26.f(x,y) =1/(1+x2+y2)7.f(x,y) =sin(x)ABCDECorrect Answers:
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AGEBDCF6.(1 point)Match the functions with the verbal description of the levelsurfaces by placing the letter of the verbal description to the leftof the number of the function.1.w=x2-y2-z22.w=x2+2y2+3z23.w=x2+y2+z24.w=p(x+2y+3z)5.w=x+2y+3z6.w=p(x2+y2+z2)7.w=p(x2+2y2+3z2)A. a collection of equally spaced parallel planesB. a collection of unequally spaced parallel planesC. a collection of unequally spaced concentric spheresD. two cones and two collections of hyperboloidsE. a collection of concentric ellipsoidsF. a collection of equally spaced concentric spheresCorrect Answers:DECBAFE7.(1 point) The graphs below show level sets for six differentfunctions, where the red areas represent the the lowest heightsand the purple areas are the highest heights.ABC

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Term
Spring
Professor
Unknown
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Level set, Peter Zhang
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