Supplementary Exercises for Section 11.6
1. Plot the polar equations r = sin(θ) and r = cos(θ) and comment on their similarities. (If you
get stuck on how to plot these, you can multiply both sides of each equation by r and convert
back to rectangular coordinates).
2. Extend Exercises 11.6.6 and 11.6.11 by rotating the curve z = mx around the z axis and
converting to both cylindrical and spherical coordinates.
3. Convert the spherical formula ρ = sin θ sin φ to rectangular coordinates and describe the
surface defined by the formula (Hint: Multiply both sides by ρ)
4. We can describe points in the first octant by x > 0, y > 0 and z > 0. Give similar inequalities
for the first octant in cylindrical and spherical coordinates.
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