2-1,4/5= ответ1/5 пожалуйста
.................................................................
(4x-1)cat = act(4x-1)
<span>(4x-1)*cosx </span>
sinx = act*(4x-1)
<span>(4x-1)*cosx </span>
sinx = 4actx-act
4x=1
x=¼
4*(5x-3y) -6*(3x-y)= 20x-12y-18x+6y = 2x-6y = -2*(3y-x) = -2*2.1=-4.2.