$sin\left(\frac{\pi}{2}-x\right)\left(secx\right)$
$4-2.81$
$1-k^{20}$
$\frac{5x^2-6x+4}{x+1}$
$-3x+2>0$
$\int x\frac{2}{3}-3x\frac{1}{2}dx$
$\frac{x^2-10}{x+1}=\frac{-14-5x}{x+1}$
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