$\int-8xe^{3x}dx$
$4\sin\left(x\right)^2-1=4\cos\left(x\right)^2$
$-6\left(2x+3\right)$
$\frac{5+y}{5}+\frac{5+y}{5}$
$cos\left(2x\right)=\frac{sin\left(4x\right)}{2sin\left(2x\right)}$
$2x^2+3xy-5y^2.-3xy^2+xy-5x^2$
$y\left[n+2\right]-4y\left[n+1\right]+3y\left[n\right]$
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