1)!!!!! tgx-sin2x=0
Tgx-sin2x=0 tgx-2tgx/(1+tg^2x)=0 tgx(1-2/(1+tg^2x)=0 tgx=0 x=πk;k€Z 1-2/(1+tg^2x)=0 (1+tg^2x-2)/(1+tg^2x)=0 1+tg^2x#0 tg^2x-1=0 tg^2x=1 tgx=1;x=π/4+πk tgx=-1;x=-π/4+πk;k€Z ответ πk;π/4+πk;-π/4+πk;k€Z