sinx=0.4
Sin^3x\(1+cosx)+sin^3x\(1-cosx)=sin^3x*(1-cosx)+sin^3x(1+cosx)/1-cos^2x = 2sin^3x/sin^2x=2sinx
ставим sinx=0.4
2*0.4=0.8
sinx=0.4
Sin^3x\(1+cosx)+sin^3x\(1-cosx)=sin^3x*(1-cosx)+sin^3x(1+cosx)/1-cos^2x = 2sin^3x/sin^2x=2sinx
ставим sinx=0.4
2*0.4=0.8