$\left(4x+3\right).\left(4x-3\right)$
$-4-5\cdot\left(-5\right)$
$\infty^2-4\infty$
$x^3t+2x^2t^2x'$
$\left(1+a^2-a-a^3\right)\left(a+1-a^2+a^2\right)$
$\left(x+4\right)^2=8x+\left(2x-1\right)^2$
$\frac{dy}{dv}=y-y^2$
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