$44x-4^{4}+9$
$\int_2^{2x}\sqrt{15-t}dt$
$-2b+2b$
$\int\frac{1}{\left(x^2-8x+20\right)\left(x-1\right)^2}dx$
$h^2+8h+16$
$\frac{sen\:a}{cot\:a}$
$\lim_{x\to0.50}\left(\frac{5.375-21.55x^2}{\cot\pi x}\right)$
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