$6x+y+x+x+9$
$-4x^2+2xy-4y^2$
$-15\cdot5$
$\left(n\right)-\left(10\right)^2$
$4x+2+13x+3$
$\tan\left(x\right)\cdot\csc\left(-x\right)\cdot\cot\left(-x\right)$
$\left(x+4\right)^{2}+\left(x-3\right)^{2}=\left(x-5\right)^{2}$
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