$4\cot\left(a\right).\csc\left(a\right)$
$4\left(x+y\right)\left(z+w\right)$
$\frac{x^3-5x^2+8}{x^2-x}$
$\int_{-2}^12xe^xdx$
$\left(\frac{5}{xcos\left(65\right)}\right)^2$
$5-2\left(x+1\right)<2\left(x+5\right)+13$
$9+1-7\cdot8$
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