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Mathematics, 19.09.2021 06:40 aj2869

2 Cos^2 O + Cos^2 20 - 2 Cas20. Cos 2 0 = 1

here 0= theta ​

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2 Cos^2 O + Cos^2 20 - 2 Cas20. Cos 2 0 = 1

here 0= theta ​...
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