$-2.80-7.69$
$\lim_{x\to0}\left(\frac{ln\left(x^2+9x\right)}{lnx}\right)$
$59-\left(-32\right)$
$\frac{\cos\left(x\right)}{1+\sin\left(x\right)}-sec\left(x\right)=-tan\left(x\right)$
$-4\left(-16\right)+16$
$2b^2+5b-3$
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