$sin2x=2cos\left(x\right)sinx\left(x\right)$
$5c+4c+4c$
$\lim_{y\to-2}\left(\frac{y+2}{\sqrt{y+3}-1}\right)$
$\left(\left(a-x\right)^{3\:}\left(a+b\right)\right)$
$3x^2+x+1;\:x=1$
$5-3+7+4-6$
$4y=x^2-8x+4$
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