$\int\frac{1}{x\sqrt{4-t^2}}dx$
$\frac{\left(1-\frac{x^2}{2}\right)^4}{4}$
$\left(-a-5b\right)\left(-a+b\right)$
$\int\frac{9}{x^2-5x+6}dx$
$x^2-4x^4$
$\left(-6-7y\right)\left(-6x+7y\right)$
$196x^2+28x+1$
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