$\lim_{x\to0}\left(t\cos\left(2t\right)\right)$
$ax-2bx+4by-2ay$
$x^5-3x^2-2x$
$2\:\cos^2\:4x-1=0$
$in\left(t^2\left(3t^2+6\right)\right)$
$f\left(x\right)=1-3\left(x+2\right)^2$
$\sqrt{19+6}$
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