$cot\left(x\right)sec^2\left(x\right)$
$\frac{1-\sin^2x}{1-\sin x}=1-\sin x$
$23mn+12mn-15mn$
$x\left(x^2+2x\right)\cdot e^{\left(2x\right)}$
$\int7\sqrt{x^2-16}dx$
$\left(y^2+4\right)\left(y^2+7\right)$
$\left(a+4\right)\left(3a^2-4a+16\right)$
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