$\lim_{x\to0}\left(\frac{7}{x}-\frac{3}{x^2}\right)$
$\left(0.4m+1.2n-2.3p\right)+\left(3.2n-4.7p-0.4m\right)$
$-5c\:+\:4\:-\:3\:+\:c$
$4cos^2x+2sin^2x-3=cos2x$
$\left(2y-5b\right)^3$
$2\:cos\:x\:\cdot\:\:tan\:x\:-\:1\:=0$
$\left(y-8b\right)^3$
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