cos(2x-1)=-v2/2


Tgп/x=7



Sin2x=П/4

Ctgx=tgп/3

12x-1=-3π/4+2πn U 2x-1=3π/4+2πn2x=1-3π/4+2πn U 2x=1+3π/4+2πnx=1/2-3π/8+πn U x=1/2+3π/8+πn,n∈z2π/x=arctg7+πnx=1/π*arctg7+1/n,n∈z32x=arcsinπ/4+2πn U 2x=π-arcsinπ/4+2πnx=1/2*atcsinπ/4+πn U x=π/2-1/2*arcsinπ/4+πn,n∈z4ctgx=√3x=π/6+πn,n∈z