$\frac{\csc^2}{\cot^2}$
$3xy+5x+2+3y+x+4$
$5x^2-45x+20=0$
$x^3-x^2+x-1$
$3x^2-2x+1\:.\:x-2$
$\csc^2k=1+cot^2k$
$\lim_{x\to\frac{\pi}{2}}\left(\frac{secx}{1\:+tanx}\right)$
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