$\left(8-5x\right)\left(8-2y\right)$
$5x^2-x-1$
$\lim_{x\to\infty}\left(t^{k-1}\cdot exp\left(-t^k\right)\right)$
$2\:+\:\frac{x^3}{e^x}$
$7\sin b+\sqrt{23}=0$
$2\:tan^2\left(x\right)=sec\:\left(x\right)\tan\left(x\right)$
$a^4-7a^2+12$
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