$\left(6^4.\:2\right)^3$
$4\sec\left(x\right)\cos\left(x\right)-1$
$\left(3x+2y+5x^2+4xy\right)^2$
$9v^2-w^2y^2$
$3x+4=7x-4$
$-2x^2-3x+4$
$\left(5x+y^2\right)^4$
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