$\lim_{x\to-3}\left(3x+4\right)\left(7x-9\right)$
$2^4+2^{-4}$
$x^2+256=0$
$x^2\:+\:5x\:+\:2$
$301x=3$
$cosx\:sin\left(x+y\right)-sinx\:cos\left(x+y\right)=sin\:y$
$\sqrt{x}-4=2-x$
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