№1.15. Build the surface and determine their view of a) 6x2 + y2 + 6z2 - 18 = 0; b) 3x2 + y2 - 3z = 0.
№2.15 write the equation and determine the type of the surface obtained by the rotation of the line around the specified axes, make a drawing: a) 7x2 - 5y2 = 35; Ox; b) x = - 1; y = - 3; Oz.
№3.15 Build body surfaces limited to:
a) x2 + y2 = 4z2; z = 0; y = x; y = 8x; x = 2; z> 0.
b) x2 + y2 = 8y; z = 0; y + z = 6.

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