log₃(-2 tan(x)) = 1/2
Write both sides as powers of 3, and use the property :
-2 tan(x) = √3
Then solve for x :
tan(x) = -√3 / 2
x = arctan(-√3 / 2) + nπ
x = -arctan(√3 / 2) + nπ
where n is any integer.
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