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June 1st, 2018, 03:25 AM   #1
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Trigonometric-Identity Problem (Quick Question)

Shouldn't the quadrant in the orange circle (or whatever it looks like) match with the quadrant in the green one (i.e., Quadrant I)? Thanks.

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June 1st, 2018, 06:09 AM   #2
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Yes. It appears "in QI" should have been "in QIII".
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