$\sqrt{9x^4}-\cot\left(x\right)$
$2x<5x+4$
$\frac{\sec\left(x\right)+\csc\left(x\right)}{\sec\left(x\right)csc\left(x\right)}=sin\left(x\right)+cos\left(x\right)$
$4xy-6xy+5y-9x$
$m^2-3m-28$
$dr-rdx=0$
$\lim_{x\to-3}\left(\frac{x^2+4x+3}{x^2+5x+6}\right)$
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