$\frac{9x^2+5}{3x}$
$34\cdot67$
$4x^5-8x^4+4x^3$
$\lim_{x\to-4}\sqrt{x^2+9}-5$
$\sin\left(x\right)+\frac{1}{\sec^2\left(x\right)}$
$\frac { x ^ { 2 } + x - 6 } { x + 3 } = x - 2$
$\left(11-cos^2x\right)\cot^2x$
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