$yx-x=x^2$
$x ^ { 4 } - 5 x ^ { 2 } + 4$
$-4x+6x-15=31$
$8.056-6.5$
$\frac{2\cot x}{1+\cot^2x}-2\sin x\cos x$
$x^2-a^2=\left(x+y\right)\left(x-y\right)$
$\left(x^2+1\right)\cdot\left(x^2-3\right)$
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