$\sqrt{a}^2-u^2$
$4\left(-2\right)^5-4\left(-2\right)^4+10\left(-2\right)^2-\left(-2\right)-6$
$\frac{secx}{cscx}+\frac{cscx}{secx}=\frac{1}{sinxcosx}$
$x^2+8x+7$
$\lim_{x\to\infty}\frac{x}{2^{x+2}}$
$-4x^2+10x-6\le0$
$t^2+17t-5040$
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