$81^5=3^x$
$y'=x^2y^{-5}$
$\frac{8}{s^3\left(s^2-s-2\right)}$
$\frac{1-sec^2x}{cosec^2x-1}$
$\left(x^8+\:\sqrt{5}\right)^2$
$16\cdot1.5$
$3x^2+5x-4=0$
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