$-2x^2+x-1\ge0$
$tanx=tanx+2sin^2x$
$\lim_{x\to-5}\left(\frac{5x^2+24x-5}{+5x}\right)$
$2^{-3}+2^0-2^2$
$\int\left(5x^4\sqrt{x^5+4}\right)dx$
$\sin\left(x\right)=\frac{3}{7}$
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