$b^4c-16b^2cd+64d^2$
$-sen^2x+3senx-2$
$\frac{4n^4-7n^2+n^2}{2n+1}$
$16k^2-1$
$3\left(x+4\right)+2\left(3x-9\right)$
$\frac{dy}{dx}=\left(x-y-5\right)^2$
$x<\frac{5}{2}\left(4x-1\right)$
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