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S=(x, 2x-1)
A=(2,-1), B=(-3, 0)
r²=|AS|²=|BS|²
|AS|²=(x-2)²+(2x-1+1)²=x²-4x+4+4x²=5x²-4x+4
|BS|²=(x+3)²+(2x-1)²=x²+6x+9+4x²-4x+1=5x²+2x+10
5x²+2x+10=5x²-4x+4
2x+4x=4-10
6x=-6
x=-1
y=-2-1=-3
S=(-1,-3)
r²=5+4+4=13
Odp. (x+1)²+(y+3)²=13
19.
sinα+cosα=x /()²
sin²α+2sinα*cosα+cos²α=1+2*sinαcosα=1+2*1/2=1+1=2
x²=2
sinα+cosα=√2