We must find just the solutions that belong to the range
(0 , 2pi).
We'll recall the identity csc x = 1/sin x and
we'll substitute csc x by the equivalent ratio, into the given
identity.
sin x = 1/sin
x
We'll multiply by sin x both
sides:
(sin x)^2 - 1 = 0
We'll
recognize the difference of squares:
(sin x - 1)(sin x + 1)
= 0
We'll cancel each
factor:
sin x = 1 => x = pi/2 radians or 90
degrees.
sin x = -1 => x = 3pi/2 radians or 270
degrees.
The solutions of the equation in
degrees, over the range (0 , 360) are: {90, 270}.
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