6×(-2)+3 - 2×(-2)-1 = -9+5=-4
(1+e^x)*y(x)*dy(x)/dx=e^x
dy(x)/dx*y(x)=e^x/(1+e^x)
∫dy(x)/dx*y(x)dx=∫e^x/(1+e^x)dx
y(x)^2/2=ln(e^x+1)+c
y(x)=√2√(ln(e^x+1)+c)
y0=1 x0=0
1=√2√(ln(1+1)+c)
1=2ln2+c
c=2-2ln2
y=√2√(ln(e^x+1)+2-2ln2
По моему так
cos(x-y)=cosx*cosy+sinx*siny cos(x+y)=cosx*cosy-sinx*sinysin(x-y)=sinx*cosy-cosx*siny sin(x+y)=sinx*cosy+cosx*siny<span>.
Ответ: </span>sinx*cosy+cosx*siny
<span>7-(2x+3)=9</span>
7-2х-3=9
2х=-5
<u><em>х=-2.5</em></u>
1/2*tg2x+1/2=0
1/2*tg2x=-1/2
tg2x=-1
2x=-π/4+πk
x=-π/8+πk/2
-7π/4<-π/8+πk/2<π/2
-13π/8<πk/2<5π/4
-13π/8*2/π<k<5π/4*2/π
-13/4<k<5/2
k={-3;-2;-1;0;1;2}