$x\:-\:4y\:=\:3$
$12+2\cdot\left(-6\right)$
$900+250-10-1000+22$
$\lim_{x\to-\infty}\left(\frac{3x}{x^2-6x+3}\right)$
$m^2+9=0$
$\left(\frac{2x}{3\sqrt{x^2+1}}\right)^2$
$cosec^2a\:cos^2a=cosec^2a-1$
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