$3.8\:x\:0.6$
$18\cdot19$
$8t^2+10t+5=0$
$\left(sec\left(x\right)+cos\left(x\right)\right)^2+\left(sin\left(x\right)-cos\left(x\right)\right)^2=2$
$\frac{dy}{dx}\left(x^2+4y^2=6x-16y+11\right)$
$x-1-x^2-3x+5-x^2+7x+12$
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