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4defa
@4defa
July 2022
1
12
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Решить уравнения: 1. cos2x-sin(п/2+x)+1=0 2. cos2x+sin(п/2-x)+1=0
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igundane
1 votes
Thanks 1
igundane
Если что,то cos(2x)=cos^2(x)-sin^2(x)=1-2sin^2(x)=1-2(1-cos^2(x))=1-2+2cos^2(x)=2cos^2(x)-1
4defa
Благодарю!
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