$\left(3x-+2y\right)\left(3x-y\right)$
$12x^2+4x^2$
$\frac{1}{\csc^2\left(x\right)\sec^2\left(x\right)}$
$y^2+4\ge0$
$x^210xy+16y^2$
$2x^2-30x+180$
$5x;\:x=7$
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