$\left(-40\right):10-\left(-5\right)\cdot9-25$
$1+8c+16c$
$1+1\infty$
$\frac{x^5+x^4-2x+3}{x-1}$
$8cos^2x=4$
$-2y\:+\:2x\:+\:8y$
$\int\frac{x+1}{\sqrt{4x^2+8x+1}}dx$
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