$y+-15.7=-5.7$
$\left(\sec\left(a\right)^2-1\right)\left(\sec\left(a\right)^2+1\right)$
$3x^2+6x-1$
$\left(5y^8x^7\right)^2$
$4x^2+x-14$
$3m^2\cdot3n^2$
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