$2\infty2$
$sec^2x\:-\:3secx\:-\:2\:=\:0$
$f\left(x\right)=\left(\sqrt{x}\right)^{cosx}$
$9^2+10x+4$
$\ln\left(15\right)-\ln\left(5\right)-\ln\left(3\right)$
$\left(\tan\left(a\right)+\tan\left(b\right)\right)\left(1-\tan\left(a\right)\tan\left(b\right)\right)$
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