2.0/(1.0 - x^2) + 4.0*x^2/(1.0 - x^2)^2
Рациональный знаменатель
[src] 2
/ 2\ 2 / 2\
2*\1 - x / + 4*x *\1 - x /
---------------------------
3
/ 2\
\1 - x /
$$\frac{1}{\left(- x^{2} + 1\right)^{3}} \left(4 x^{2} \left(- x^{2} + 1\right) + 2 \left(- x^{2} + 1\right)^{2}\right)$$
/ 2\
2*\1 + x /
----------
2
/ 2\
\-1 + x /
$$\frac{2 x^{2} + 2}{\left(x^{2} - 1\right)^{2}}$$
/ 2\
2*\1 + x /
------------------
2 2
(1 + x) *(-1 + x)
$$\frac{2 x^{2} + 2}{\left(x - 1\right)^{2} \left(x + 1\right)^{2}}$$
2
2 + 2*x
-------------
4 2
1 + x - 2*x
$$\frac{2 x^{2} + 2}{x^{4} - 2 x^{2} + 1}$$