1,5x-x=4+4
0,5x=8
x=8:0,5
x=16
A)-2cosx*sinx=√2cosx
√2cosx+2cosx*sinx=0
cosx(√2+2sinx)=0
cosx=0; 2sinx=-√2
x=π/2+πn.n∈Z; sinx=-√2/2
x=(-1)ⁿ⁺¹π/4+πn, n∈Z
б)[-5/2π;-π]
x=-3π/2; -3π/4; -9π/4.
-3,1m-(-1+5,9m)+(4-m)
-3.1m+1-5.9m+4-m
-10m+5
1) a = 15 см; b = 15:3 = 5 см
2) AB = 16 см; CD = (16/4)*3 = 12 см