$+\left(-10+4\right)-\left(+9-3\right)-\left(-2\right)$
$9cos\left(x\right)+9sin\left(x\right)tan\left(x\right)=9sec\left(x\right)$
$a^2+2a-12$
$-11\:x\:\left(+6\right)$
$\lim_{x\to2}\left(\frac{x+\sqrt{x+2}}{\sqrt{4x+1}-3}\right)$
$\frac{v^4}{v^3}$
$-2x^2+2x+3$
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