Ex: Solve a Factorable Trig Equation with Exact and Rounded Radian Solutions

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This video explains how to solve a factorable trigonometric equation that contains exact and approximate radian solutions.
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where in the hell did he get the 5 for the cosine, and last i checked 10 +(plus) 8 is 18 not 2.why did he subtract.

emiliogilliam