$tan\theta\:csc\theta\:=sec\theta\:$
$\left(x+2\right)\left(x^2-2x+4\right)-x^3$
$y=x^2+\frac{c}{x^3}$
$\frac{c}{x}+c$
$\frac{25b^7}{25b^4}$
$4t^2+15t-19$
$\left(5a^3b^4+7c^5\right)^2$
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