$cos\left(5x\right)\:sen\left(5x\right)$
$3\left(x+10\right)+4\left(x+20\right)+5x=185-3x$
$\left(8xy+2x-8xy+2\right)$
$\lim_{x\to0}\left(7xlnx\right)$
$8x-9=7x+6-2x$
$-9w+5-8w-4$
$y^4\left(x\right)-r^4y\left(x\right)$
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