$\lim_{x\to0}\left(\frac{x^2-sin^2\left(ax\right)}{tan^2\left(bx\right)}\right)$
$y^2+8y\:+7$
$\left(9x+2y\right)\left(2x-2y\right)$
$36a^2+60ab+25b^2$
$8ax^2-2a$
$9v^2-25=0$
$y^2-25w^2$
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