$\frac{12x-y}{-2x+2y}$
$\left(\sin x+1\right)\left(tanx-secx\right)=-cosx$
$tan\:x\:=\:3.85$
$\lim_{x\to0}\left(\frac{\sin\left(12x\right)}{4x}\right)$
$-3\left(4x+3\right)+4\left(6x+1\right)=43$
$\left(9^9\right)^9$
$\left(t+\frac{1}{9}\right)\left(t-\frac{1}{9}\right)$
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