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PAIN1999
@PAIN1999
July 2022
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Упростить выражение:
а) cosx*cos3x-sinx*sin3x
б) sin2x*cosx+cos2x*sinx
в) sinx*cos3x+cosx*sin3x
г) cosx*cos2x+sinx*sin2x
Вычислить:
а) (cos18°*cos7°-sin18°*sin7°)²+(sin19°*cos6°+cos19°*sin6°)²
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pomoshnik09
А)=соs(x+3x)=cos 4x b)=sin (2x+x)=sin 3x 3)=sin(x+3x)=sin4x
1)=cos²(18+7)+sin²(19+6)= cos²25+sin²25=1
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Answers & Comments
1)=cos²(18+7)+sin²(19+6)= cos²25+sin²25=1