$\frac{d^2}{d^2x}\left(x^2+y^2=5\right)$
$\frac{2\sin\left(x\right)}{\cos\left(x\right)^2}$
$x^2+2x^2+1-1$
$x^2+4<5$
$\left(x-0\right)^2+\left(y-0\right)^2=0$
$4x\left(x-5\right)-x-5$
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