The bottom terms can be slightly simplified, although it doesn't really look that much prettier in the text.
2 + a(1-a) = 2 + a - a^2 = -1(a^2 - a - 2) = -1(a-2)(a+1) = (2-a)(a+1)
y_1 = (1-a)/(2+a(1-a)) = (1-a)/( (2-a)(a+1) )
x_1 = 2(1-a)/(2+a(1-a)) = 2(1-a)/( (2-a)(a+1) )
y_0 = 2/(2+a(1-a)) = 2/( (2-a)(a+1) )




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