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This is a quadratic equation for csc(x). The roots are 1 and -4.
csc(x)=1/sin(x), so we have two possibilities:
sin(x)=1 or sin(x)=-1/4.
The roots of these equations in `(0, 2pi)` are
`pi/2,` `pi+arcsin(1/4)` and `2pi-arcsin(1/4).`
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