$1+-100$
$-15xy+40xy$
$\cot\left(x\right)+\sin\left(x\right)=\cot\left(x\right)$
$9+243$
$4f^4-12f^3$
$7 x ^ { 2 } + x 4 - y ^ { 2 } = 4$
$4x^2+23x+33=2x+8$
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