$\lim_{x\to\infty}\left(\frac{2x+3}{2x+1}\right)^{x+1}$
$-8y+12xy-3y$
$\int\:x\:sen\:\left(5x\right)\:dx$
$\int2\sin\left(9x\right)^2\cos\left(9x\right)dx$
$\left(3xy+2z^2\right)\left(3xy-2z^2\right)$
$\frac{dy}{dx}=-15x^2=8$
$\sqrt{2475n^5y^4}$
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