$2^3\cdot2^{-3}$
$\frac{15x}{3x-9}$
$49-y^4$
$\frac{-2x^3+6x^2+8}{x+2}$
$1-\csc^2x+\csc^2x$
$\left(3x-2y\right)^2-\left(4x-y\right)^2$
$\:\frac{tan\left(x+b\right)-tan\left(b\right)}{1+tan\left(x+b\right)tan\left(b\right)}$
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