$\sin\left(a\right)+\sin3a$
$\lim_{x\to\infty}\left(n\cdot e\right)^{\left(-n^2\right)}$
$-6x^2+2x+1$
$\left(2n+9\right)\left(2n-9\right)$
$\left(\frac{7}{2}x+\frac{8}{5}y\right)\left(\frac{7}{2}x-\frac{8}{5}y\right)$
$3x^2-8x-20$
$9^3\cdot9^{12}$
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