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If yo haven't watched my video SUM AND DIFFERENCE FORMULAS, it may be a good idea to watch
it now, here: http://bit.ly/2iY3TUQ

In this video we introduce the double angle trigonometric formulas, and we do a problem
where you are asked to calculate the double angle trigonometric formulas, given one of the
trigonometric functions of the angle and the quadrant the angle is in.