$=\frac{1}{\sec x^2}$
$0+\infty$
$2x^{-2}+5x^{-1}-12=0$
$5\left(-11b\right)$
$r^6z^2\cdot7r^4z^5\cdot2rz^4$
$3yx^2-2y=x$
$8-\left(-15\right)$
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