$\int_1^{\infty}\left(\frac{\sqrt{x}}{3^x}\right)dx$
$\frac{2x^2+4x}{2x}$
$7+4-2+5+1-1-2+3$
$\left(\frac{4^5}{4}\right)^3$
$\frac{x^4+4x^3+3x^2-2x+2}{\left(x+1\right)\left(x^2+2x-1\right)}$
$\frac{35x^5+243y^5}{2x+2y}$
$cot\:a\:=\:\left(sec\:a\:-\:tan\:a\right)\:\left(csc\:a\:+\:1\right)$
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