cos п(4x-10)/4 = корень из 2/2

П/4(4x-10)=П/4+2Пk               П/4(4x-10)=-П/4+2Пk

x-2,5=1/4+2k                          x-2,5=-1/4+2k

x=2,75+2k                               x=2,25+2k