$\frac{16}{4}+3$
$9+\cot\left(x\right)^2=12$
$\frac{\frac{1}{5+x}-\frac{1}{5}}{x}$
$\frac{1}{sin}-\frac{1}{tan}=\frac{11}{2}$
$\left(\frac{5}{4}n+\frac{3}{2}\right)\left(\frac{5}{4}n-7\right)$
$4x^2-3\:si\:x=3$
$x^2+26x-129$
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