$-15a^2-24a^2$
$\left(3x-8y^2\right)^2$
$5x+3=-27$
$\left(a^{-1}+3x\right)\left(a^{-1}-3x\right)$
$\frac{1+sin^2}{1-sin^2}+1=\:2\:sec^2$
$-\left(-5\right)-\left(-2\right)$
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