$x^2-3x+6>\:0$
$\lim\:_{x\to\:+\infty\:\:}\frac{e^x+e^{-x}}{e^x-e^{-x}}$
$sin\left(90d-x\right)$
$3a^2x^{a+3}y^{2a-2}=7$
$-2a+-6+4a$
$\frac{\cos^2\left(x\right)}{1-sin\left(x\right)}-sin\left(x\right)=1$
$3\left(v^2+11v+30\right)$
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