Найдите 25cos2α, если sinα=−0,7
sin2a+cos2a=1
25cos2α=25(1-sin2α)=25(1-(-0.7)2)=25(1-0.49)=25*0.51=12.75
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sin2a+cos2a=1
25cos2α=25(1-sin2α)=25(1-(-0.7)2)=25(1-0.49)=25*0.51=12.75