Ответ:
Cos2β = 2Cos²β -1 = 2*0,49 -1 = 0,98 -1 = -0, 02
4 + Cos2β = 4 - 0,02 = 3,98
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Ответ:
Cos2β = 2Cos²β -1 = 2*0,49 -1 = 0,98 -1 = -0, 02
4 + Cos2β = 4 - 0,02 = 3,98