$\lim\:_{x\to\:\frac{\pi\:}{4}}\cot\left(x\right)$
$2\sec30\cos60$
$x^2-16x+172$
$4x^2+3x+2x^2+x$
$\frac { 4 x ^ { 3 } + 4 x - 12 } { 2 x + 4 }$
$67^1$
$\frac{d}{dx}5^{6x}$
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