$\frac{\sin^2x+\cos^2x}{1-\cos^2x}:csc^2x$
$8-x^{3\:}y^3$
$\lim_{x\to0}\left(\frac{4^x-1}{8^x-1}\right)$
$5n-8=37$
$\int2^x\cdot5^x$
$-2x^2+3y-5x^2-y+x$
$\frac{1}{\csc\left(x\right)+1}-\frac{1}{1+\sin\left(x\right)}=1$
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