$\frac{dy}{dt}\:=\:\left(y-1\right)\left(y+1\right)$
$225\sqrt{9a^8}n^7\ 15\sqrt{3a^8}n^7$
$\left(-22\right)+33+9$
$-5t^3+2t^3$
$-10y+6y=28$
$0.81g^2-\left(f+g\right)^2$
$\left(5x^2\right)^0\left(9x\right)^2$
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