$tan\left(b\right)\cdot cot\left(b\right)$
$\frac{2x^2-13x-21}{4x^2+9x-9}$
$30m^2-3m+6$
$\left(10\right)^2-\left(6\right)^2$
$6-48a$
$e^9=x$
$\lim_{x\to\infty}\left(4^{-x}\right)$
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