$x^2-28x+192$
$sec^2x-\frac{4}{3}=0$
$\lim_{x\to\infty}\left(\frac{x}{x^2+5}\right)$
$\frac{1+sin\left(-x\right)}{1+csc\left(-x\right)}$
$\int\sqrt{\left(1+\sin\left(2x\right)\right)}dx$
$\left(27-30+21\right):\left(-3\right)$
$3 x ^ { 5 } - 2 x ^ { 2 } + 9 x ^ { 4 } - 5 x + 3$
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