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# Describe the sets of points in 3-space that satisfy the equations. Here, $r , \theta , R$ , and $\phi$ denote the appropriate cylindrical or spherical coordinates. $\phi = \pi / 2$

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$\phi=\frac{\pi}{2}$

$x=\sin\left(\frac{\pi}{2}\right)R\cos\theta=R\cos\theta, y=\sin\left(\frac{\pi}{2}\right)R\sin\theta=R\sin\theta,z=\cos\left(\frac{\pi}{2}\right)R=0\qquad{0\leq\theta\leq2\pi, R\geq0}$

Hence we are in $x-y$ plane or $z=0$ plane

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