Helpppppppppppppppppp tgx-ctgx=1
Ctgx=1\tgx tgx-1\tgx=1 tg^2x-tgx-1=0 x ∈ {(4*пи*k+asin(4/5)-пи)/4, (4*пи*k+asin(4/5)+пи)/4}, k ∈ Z