$\left(2s^2+5\right)-5\left(3s^2+8\right)$
$5x-12\ge3x-4$
$tg\infty+cotg\infty=sec\infty.cosec\infty$
$\left(a^2-3\right)\left(a^2+8\right)$
$\left|3\left(3-1^3\right)\right|-2\left|6\right|$
$\frac{1}{\cos^6}$
$y-3x\:+\:5-4y-7$
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