$\cos^2\left(x\right)dx=\tan^2\left(y\right)dy$
$\frac{a^2-11a+30}{a-5}$
$12-\left(-6\right)$
$\left(2x+3y\right)\left(-x+2x^2+3y^2\right)$
$\int\frac{2x-\frac{4}{5}}{\left(x^2-1\right)}dx$
$\left(2a+b\right)\left(2a-b\right)-\left(2a+b\right)^2$
$5\left(2x-4\right)\le4x+1$
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