$-177\left(5\right)$
$\frac{2x^4-7x^3+9}{x^2+3}$
$\frac{1}{x+1}+\frac{1}{x-1}=\frac{2}{x^2-1}$
$2a-4\:para\:2a$
$\lim_{x\to0}\left(\sin\left(x\right)\right)^{tan\left(x\right)}$
$\sqrt[2]{0.56}$
$\frac{6x^5+4x^3-3}{2x^2+4x+5}$
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