$-\frac{\cos^2\left(x\right)}{\sin\left(x\right)}$
$x^2-20x+25$
$cos\left(x\right)\left(2sin\left(x\right)+\sqrt{3}\right)\left(-\sqrt{2}\cos\left(x\right)+1\right)$
$4\:3\:-5\:3\:4$
$\frac{x-2}{4}+\frac{3x+2}{6}$
$x+9>2$
$1x^2+1x+0,25$
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