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rimmabuketova
@rimmabuketova
July 2022
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Найдите значение выражения 1,25*cos2x, если sinx=0,4
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dasdasfa
1,25cos 2x; sinx=0,4
sin^2 x=(1-cos (2x))/2
cos(2x)=1-2sin^2 x
cos(2x)=1-2*0,4=1-0,8=0,2
25cos(2x)=25*0,2=5
1 votes
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AnastasiyaSi
Решали такое в классе
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Answers & Comments
sin^2 x=(1-cos (2x))/2
cos(2x)=1-2sin^2 x
cos(2x)=1-2*0,4=1-0,8=0,2
25cos(2x)=25*0,2=5