Question Number 45654 by ajfour last updated on 15/Oct/18
Commented by ajfour last updated on 15/Oct/18
$${Estimate}\:{minimum},\:{maximum}\:\boldsymbol{\phi}\: \\ $$$${in}\:{terms}\:{of}\:{r}\:{and}\:{R}.\:{Equation}\:{of} \\ $$$${ellipse}\:{being}\:\:\:\frac{{x}^{\mathrm{2}} }{{R}^{\mathrm{2}} }+\frac{{y}^{\mathrm{2}} }{{r}^{\mathrm{2}} }=\mathrm{1}\:. \\ $$