$6x-x^2-7$
$csc^4x-cot^4x$
$\sqrt{20}-2\sqrt{5}$
$1-\frac{sin^2\left(x\right)}{1+cos\left(x\right)}$
$15x^2-6xy+9xz$
$80+44+200$
$\left(275-2x\right)\left(200-2x\right)x$
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