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How to know what quadrant 19Π/6 lies and what is the value.

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19Π/6 can also be written as:
12Π/6 + 7Π/6, which is also equal to:
2Π + 7Π/6.
And since 2Π is equal to one revolution, we can say that the value of 19Π/6 is the same with 7Π/6, which can be found at quadrant 3,
having the value (-√3 /2, -1/2).