Пожаааалуйста
sina-sin3a\cos3a+cosa
1-cos2a\sin(П+2)
1-cos2a\sin(П-2)
\ это дробная черта.
sina-sin3a\cos3a+cosa
1-cos2a\sin(П+2)
1-cos2a\sin(П-2)
\ это дробная черта.
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Answers & Comments
(cos(3 a)+cos(a))/(2 cos(a))+2 sin^2(a)=((4cos^3(a)-3cos(a)+cos(a))/2cos(a))+2sin^2(a)= ((4cos^3(a)-2cos(a))/2cos(a))+2sin^2(a)=2cos(a)*(2cos^2(a)-1)/2cos(a)+2sin^(a)=2cos^2(a)-cos^2(a)-sin^2(a)+2sin^2(a)=cos^2(a)+sin^2(a)