Precalculus Examples

$4 x^{2} + 4 y^{2} - 2 x - 9 y + 1 = 0$

Since both variables are squared and the coefficients of the squared terms are the same, including the sign, the conic is a circle.

Circle

$[\begin{array}{c} x^{2} & \frac{1}{2} \\ \sqrt{π} & \int x d x \end{array}]$