$\left(a+7b^{n+2}\right)^2$
$\int x ^ { - 45 } d x$
$4x\left(6x-4x\right)$
$1-\frac{sin^2x}{tan^2x}$
$\frac{1}{6x-x^2}$
$x^2-9-4$
$sec\:a\:-\:sin\:a\cdot\:tan\:a$
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