$y\left(1-x\right)dx+x^2\left(1+y\right)dy=0$
$16x^4-36$
$\left(3x+2\right)^2+\left(2x+3\right)^2-\left(2x-3\right)^2-\left(3x-2\right)^2$
$\left(x+3\right)\left(x+6\right)>0$
$\tan30\cdot\sin30+\cos30=\sin30$
$\left(2x+6\right)\left(3x+2\right)\:-\:\left(6x+1\right)\left(x-5\right)$
$\int\frac{x-1}{x^2\left(x^2+1\right)}dx$
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