Proof: cos(a + b) = (cos a)(cos b) - (sin a)(sin b) - Free Educational videos for Students in K-12

Proof: cos(a + b) = (cos a)(cos b) - (sin a)(sin b) - By Khan Academy

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DESCRIPTION:

Proof of the trig identity: cos(a+b) = (cos a)(cos b)-(sin a)(sin b). In an easy conversational tone, the instructor uses the computer screen as his 'blackboard' and different colors to emphasis his points. For high school students.

OVERVIEW:

Proof: cos(a + b) = (cos a)(cos b) - (sin a)(sin b) is a free educational video by Khan Academy.It helps students in grades HS practice the following standards HSF.TF.C.9.

This page not only allows students and teachers view Proof: cos(a + b) = (cos a)(cos b) - (sin a)(sin b) but also find engaging Sample Questions, Apps, Pins, Worksheets, Books related to the following topics.

1. HSF.TF.C.9 : Prove the addition and subtraction formulas for sine, cosine, and tangent and use them to solve problems..