$3sen\left(2\right)x+sen\left(2\right)x=3$

$\left(a+15\right)^3$

$\left(x^3\:-5y^2\right)^2$

$\lim_{n\to\infty}\left(\frac{\left(2n+1\right)^2}{2n^2+3n+1}\right)$

$\int\left(3\right)^{-2x}dx$

$\lim_{x\to\infty}\left(\frac{\pi+\ln\left(x\right)}{x^2-1}\right)$

$3s^3+2s^2+3s$