1-sin^2= (1-cos)(1+cos)= 1+sin^2+cos^2= sin-sin*cos^2= sin^4+cos^4+2sin^2*cos^2= tg^2-sin^2*tg^2= cos^2+tg^2*cos^2= tg^2(2cos^2+sin^2-1)= ! 150

irina0208ga    3   15.04.2019 18:37    0