1)(√10)²=10
2)(√3,2)²=3,2
3)(-√7)²=7
4)-(√13)²=-13
5)(-√2)²=2
6)(√(-5)²)²=25
7)-(-√17)²=-17
8)-(-√(-6)²)²=-36
Sin 3x - Sin 7x = √<span>3 Sin 2x
-2Cos5x Sin2x = </span>√3Sin2x
-2Cos5x Sin2x - √3Sin2x = 0
2Cos5x Sin2x + √3Sin2x = 0
Sin2x(2Cos5x + √3) = 0
Sin2x = 0 2Cos5x +√3 = 0
2x = πn , n∈Z Cos5x = -√3/2
x = nπ/2, n ∈ Z 5x = +-arcCos(√3/2) + 2πk , k ∈Z
5x = +-π/6 + 2πk , k ∈Z
x = +-π/30 + 2πk/2, k ∈Z
Б) a^2+1-6a+4
a^2-6a+5
D=36-4*1*5=16
<span>√D=8
x1= 6+8/2=7
x2=6-8/2=-1</span>