Sal evaluates the cosine of twice anï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½angle whose right triangle is given. To do this, he must use the cosine double-angle formula.
Addition and subtraction trig identities is a free educational video by Khan Academy.It helps students in grades 0 practice the following standards HSF-TF.C.9.
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