$cos^2a\left(csc^2a\right)+cos^2a\left(sec^2a\right)=csc^2a$
$\left(2a-9\right)\left(2a+11\right)$
$\int\frac{x}{2x-2}dx$
$\frac{10-5sec^2x}{sec^2x}$
$\frac{1}{16}y\left(y^2-9\right)$
$c^2-2ac+2b;\:a=-2;\:b=-3$
$\int\frac{2x-1}{\left(x^2-2x+5\right)^2}dx$
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