$14^{-1}\cdot14^1$
$\lim\:_{t\to\:\infty\:}\sqrt{t^2+1}-\sqrt{t^2+4}$
$\:\left(+23\right)\:-\:\left(-12\right)$
$81y^2-36y+4$
$2x^2+8x-3$
$\left(-4-3\right)\cdot\:8$
$t^2+14t+49$
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