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5:52
YouTube
TucsonMathDoc
How to find sin(30) and cos(30) WITHOUT A CALCULATOR | Unit Circle | Special Triangles Trigonometry
Dr. Pan finds sin(30), cos(30), sin(45), cos(45), sin(60) and cos(60) without a calculator. Help your child succeed in math at https://www.patreon.com/tucsonmathdoc
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