cos^2x+sin^2x+2sin^2x=1,25
2sin^2x=1/4
sin^2x=1/8
sinx=sqrt(2)/4
sinx=-sqrt(2)/4
x=+-arcsin(sqrt(2)/4)+2Пk
x=+-(arcsinsqrt(2)/4-П)+2Пk
cos^2x+sin^2x+2sin^2x=1,25
2sin^2x=1/4
sin^2x=1/8
sinx=sqrt(2)/4
sinx=-sqrt(2)/4
x=+-arcsin(sqrt(2)/4)+2Пk
x=+-(arcsinsqrt(2)/4-П)+2Пk