$3a+b-c-\left(a+b\right)$
$\sin\left(x\right)\ln\tan x$
$2x\:+3x\:-4.5x$
$p\left(x\right)=8x^2ln\left(1-x\right)$
$5x^2+3y^2=16$
$679\cdot5$
$\sqrt{4^2+4^2}$
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