Б) y=-2x-2
A(10;-20) -20=-2×10-2
-20=-20-2
-20=-22(не проходит)
Log2 ( (sinα+cosα)²-1-1\2sin2α)²+1\4cos²2α)=log2 ((sin²α+2sinα·cosα+cos²α-
-1\2sin2α)²+1\4cos²2α= log2 (1\4sin²2α+1\4cos²2α)=log2 (1\4(sin²2α+cos²2α)=log2 1\4=-2
(х+2+7)(х+2-7)=0
(х+9)(х-5)=0
ответ: х1=-9; х2=5
<span>(5-a)(3a+1)-3a(4-a)=2a+5</span>
7 - 2x + 9 = 6 - x
- 2x + x = 6 - 9 - 7
- x = - 10
x = 10