<span>у/8 + х/5 = 1
y/8 =- x/5 +1
y = - 8/5 x +1
tg = - 8/5</span>
Решение задания смотри на фотографии
a)2m^3+n^2-1-n^2+2m^3=4m^3+n^2-1
б)3x^3-2y-5x^3-2+2y-7=-2x^3-9
Cos4x*cosx+sin4x*sinx=0
cos(4x-x)=0
cos3x=0
3x=П/2+Пn
x=П/6+Пn/3
<span>16 cos20 cos40 cos60 cos80=8 cos20cos40cos80=8cos20cos40cos80sin20/sin20=4sin40cos40cos80/sin20=2sin80cos80/sin20= sin160/sim20=sin(180-20)/sin20=sin20/sin20=1
соs60=1/2</span>