14-7 Maximum and Minimum Values.sagews

var('y')
plot3d(x^2+y^2, (x, -1, 1), (y, -1, 1))
plot3d(x^2-y^2, (x, -1, 1), (y, -1, 1))

y

3D rendering not yet implemented

3D rendering not yet implemented

# 37
var('y')
plot3d(-(x^2 - 1)^2 - (x^2*y - x - 1)^2, (x, -2.1, 2.1), (y, -2.1, 2.1), aspect_ratio = [1, 1, 0.1])

y

3D rendering not yet implemented

# 38
plot3d(3*x*exp(y) - x^3 - exp(3*y), (x, -5, 5), (y, -5, 5))

3D rendering not yet implemented