$\frac{\sec^2+\tan^2}{\sec^2-\tan^2}$
$5x^2+6xy=5$
$\frac{3^{x-2}}{8}-2^{x-2}=0$
$\left(x^4+8\right)\left(x^4-2\right)$
$\int\frac{x^2}{-x^2+a}dx$
$\sqrt{5}-\sqrt{5}$
$123.078+9.300+45.650$
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