The first step is to isolate (sin y)^2 to the left side. For
this reason, we'll add (sin y)^2 both sides:
11 (sin y)^2 + (sin
y)^2 = 13
12 (sin y)^2 =13
We'll divide
by 12:
(sin y)^2 = 13/12
sin y = sqrt
(13/12)
But sqrt (13/12)>1 and -sqrt (13/12) < -1,
which is impossible because the limit values of the sine function are -1 and
1.
So, there are no angles to satisfy the given
equation, or, more precise, the equation has no solution.
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