$\csc\left(90-x\right)\cot\left(x\right)$
$50x^4-30x^3+40x$
$\lim_{x\to1}\left(\frac{x^2-1}{e^{x^2}-x}\right)$
$-3\left(f+4\right)$
$\lim_{x\to\infty}\left(\frac{\sqrt{9x^6+2x^2+5}}{4x^2-1}\right)$
$x\le6-x$
$-2\left(-9\right)-6$
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