$11 x ^ { 4 } - 11 x ^ { 5 }$
$\frac{1+\cos x}{cot\:x}=\tan x+sin\:x$
$-\left(-2\right)^2^2$
$4-+-8$
$x^2yz+3xy^2-2xyz^2-3xy^2z+xyz^2-x^2yz$
$9a\cdot2a^3$
$11-\left[7-4\left(2\right)-\left(1+2\right)\right]$
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