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Active Calculus - Multivariable

Activity 9.8.13.
(a)
Draw the region described by \(\rho \leq 1\) and \(0 \leq \phi \leq \frac{\pi}{2}\text{.}\)
(b)
Draw the region described by \(x^2+y^2 \leq 9\) with \(x\leq y\) and \(-1 \leq z \leq 3\)
(c)
Give a set of inequalities in spherical coordinates that describes the points in the seventh octant.