$\left(4-9\right)^2-15^3-137$
$\tan\left(\frac{u}{2}\right)+\cot\left(\frac{u}{2}\right)=2\csc\left(u\right)$
$\left(a^2x+8b^4\right)^2$
$4u-4\ge-16$
$\frac{1}{\sin\left(x\right)^2}-\cot\left(x\right)^2$
$-2x^2-5x+2$
$4x^3y-51x^3y$
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