Sin(180+60)+cos(360*3+120)-tg(2*360-150)=
=sin60+cos120-tg150=√3/2-1/2-tg(180-30)=
=√3/2-1/2-√3/3
(x-x1)\x2-x1=(y-y1)\y2-y1
(x-2)\-1-2=(y+15)\18+15
-11(x-2)=y+15
-11x+22=y+15
-11x-y=-7
11x+y-7=0
A) 2m-m=13=3
m=16
Б) 3-5с+1=1-с
3-1+1=-с+5с
3=4с
с=3/4
с=0.75
X\3 = arctg 3\2 + πn | * 3 , n∈Z
x= 3arctg 3\2 + 3πn , n∈Z