$2.4578-1.34$
$36a^2-81y^2$
$\int\frac{x^2}{\sqrt{-4x^2+9}}dx$
$\frac{dy}{dt}+4y=e^{-t},\:y\left(0\right)=1$
$\frac{\sin^2\left(y\right)}{\cos\left(y\right)}+\cos\left(y\right)=\sec\left(y\right)$
$f^2-5f-14$
$4x^2-6x-1=0$
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