$\lim\:_{x\to\:\frac{\pi\:}{2}}\left(\left(cosx\right)cos\left(tanx\right)\right)$
$32.1-7.4$
$5.10\:+\:5.\:\left(-4\right)$
$x^2+10x+81$
$0,048+0,125-3,001$
$4x\:-\:6x^2\:+\:9x\:+x^3\:-\:7x\:+11^2$
$-9x^2-3x+20$
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