$1\frac{d}{dx}$
$\left(9a-2\right)\left(9a+2\right)$
$-3\:\:-\:\left(\:5\:-\:6\:-\:1\:\right)\:+\:2\:$
$-1.55+2$
$x^2-4x+1=\:0$
$\lim_{x\to\infty}\left(\frac{7x}{x^2+2x-6}\right)$
$\left(x+2y+4\right)^2$
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