РЕшите уравнение: 1)tg(2x-10 градусов)= 2)2cos(-x)+1=0 3)2cos(-x)+1=0
1)2x-10=π/6+πn 2x=10+π/6+πn x=5+π/12+πn/2 2)cos(π-x)=-1/2 -cosx=-1/2 cosx=1/2 x=+-π/3+2ππn 3)cos(π/3-x)=-1/2 π/3-x=+-2π/3+2πn -x=-π/3+2π/3+2πn⇒-x=π/3+2πn⇒x=-π/3+2πn -x=-π/3-2π/3+2πn=⇒-x=-π+2πn⇒x=π+2πn