<span>2x-8x=0
-6x = 0
x = 0 : -6
x =0</span>
<span>2х+2у-5=0
2y=-2x+5
y=-x+5/2
tg</span>α=k=-1
α=π/4+π=45°+90°=135°
Sin5П*cosx-sinx*cos5П=cos2x*cos7П-sin2x*sin7П
sinx=-cos2x
sinx=sin^2(x)-cos^2(x)
sinx=sin^2(x)-1+sin^2(x)
2sin^2(x)-sinx-1=0
sinx=y,-1<=y<=1
2y^2-y-1=0
y1=1,y2=-1/2
sinx=1
x=π/2+πn
или
sinx=-1/2
x=(-1)^n*arcsin(-1/2)+πn=(-1)^n*(-π/6)+πn
Х квадрат = 7
х = корень из 7
2. 3
3. 2
4. 1-2(5-2х)=-х-3; 1-10+4х+х+3=0; 5х-6=0; 5х=6; х=1.2. ответ: 1.2
5. 243