$\frac{cos}{sin}=3$
$\left(\frac{3\sqrt{11}}{11}\right)^2+\cos^2\left(x\right)=1$
$cotx+\frac{1}{cotx\:}=\frac{\left(\left(cotx\right)^2+1\right)}{\left(cotx\right)^2}$
$\left(11x-5y\right)^2-\left(13x+3y\right)^2+\left(x-2y\right)$
$18-\left(-6\right)+\left(+7\right)-\left(-10\right)$
$x^2\:-\:3x$
$12a-5b+\left(3a-2b\right)-\left(8b-10\right)$
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