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lollikun
@lollikun
July 2022
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1.Найдите sin a , если cos2a =0.82 и a 2 ( П;0)
2.Найдите sin2a , если sin a =0.6 и a 2 (п\2; 3п\2)
Помогите ,пожалуйста .-.
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Rushioner
1) что-то тут не так, не могу решить
2) sin2a = 2sina*cosa
Cos^2a = 1 - 0,36 = 0,64
Cosa = 0,8
Sin2a = 2*0,6*0,8 = 0,96
Тут вродь правильно
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Answers & Comments
2) sin2a = 2sina*cosa
Cos^2a = 1 - 0,36 = 0,64
Cosa = 0,8
Sin2a = 2*0,6*0,8 = 0,96
Тут вродь правильно