Mathematics, 18.08.2019 11:30, xavierbanks802
Cos a = square root 21 divided by 5 and sin a = 2/5. what is the exact value of cos 2a?
Answers: 3
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Cos a = square root 21 divided by 5 and sin a = 2/5. what is the exact value of cos 2a?...
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