$26\cdot26^8$
$-s^5\left(2s+3s-5s\right)$
$x^2+3x^2+2x+1\:.\:4$
$u\cdot u^3$
$\lim_{x\to0}\frac{5x^3-4}{x^2-3x+2}$
$secx-sinztanx=cosx$
$5^2-\left(-5^2\right)$
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