$\left(40-0.7k\right)^2$
$\left(15\right)\cdot\left(79-48\right)$
$2sin^2x-1=cos2x$
$\frac{3x+5}{x^2+3x+2}$
$\sin\:2x+\sqrt{3}\sin\:x=0$
$7r+14s$
$c^445c^2+100$
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