$f\left(x\right)=\frac{x^2-5x}{x^2-25}$
$5a^2\:-\:45b^4$
$\int4\cos\left(6x\right)dx$
$y^{1-1}$
$\lim_{n\to\infty}\left(1+\frac{1}{2n}\right)^n$
$\cos\left(a\right)=\frac{\left(\cos\:\left(3a\right)+\cos\:\left(a\right)\right)}{2\cos\left(2a\right)}$
$\left(3x^3-a^3+2ax^2\right)\left(2a^2-x^2-3ax\right)$
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