Question

ctg2xcosx^2=ctg2xsinx^2

Answer 1

ctg2x*(cos²x-sin²x)=0
ctg2x*cos2x=0
cos³2x/sin2x=0
cos2x=0
2x=π/2+πn,n∈z
x=π/4+πn/2,n∈z

Answer 2

почему? cos³2x/sin2x=0
cos2x=0