$sec^2x+csc^2x-tax^2x-cot^2x$
$y\:=\sqrt{\frac{x-4}{x^4+2}}$
$16+2+9$
$x^2+16x+48$
$\sqrt{\left(2x+3\right)^2}$
$\left(5x^3+3y\right)^2$
$\frac{8^{18}}{8^{13}}$
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