$\int\frac{x^2}{\left(x^2-1\right)\left(x^2+4\right)^2}dx$

$\left(x-y\right)y'=x+y$

$\left(3x^5+3x\right)^2$

$-a^2+b^2-10+a^2-b^2+10$

$\left(x^{8}-x^{6}+x^{4}-x^{2}+1\right):\left(x-2\right)$

$a^2\cdot b^3\sqrt[3]{a^8\cdot b^7}\cdot ab$

$sin^2x+\:sin^2x+tan^2x=tan^2x$