Х+3/х=-4|*х
х^2+3=-4x (х не равен нулю)
x^2+4x+3=0
D=4^2-4*3*1=16-12=4
x1=(-4+2)/2=-1
x2=(-4-2)/2=-3
Ответ: х=-1; х=-3
Y' =2x + cosx; y'(π) = 2π- 1;
3sinx+4cosx=-5
5(3/5sinx+4/5cosx)=-5
sin(x+a)=-1,sina=4/5 U cosa=3/5
x+a=-1⇒x=-a-π/2+2πn
x=-arcsin4/5-π/2+2πn,n∈z
879,4=8,794 * 10²
550=5,5 * 10²
0,0009 = 9 * 10⁻⁴
58,7=5,87*10¹