$9x+9x+1$

$x\pi^2-16$

$\frac{1-\sin\left(a\right)}{\cos\left(a\right)}-\frac{\cos a}{1-\sin\left(a\right)}=\frac{2}{\cos\left(a\right)}$

$16g^4+4g^3$

$3\sin^2\left(x\right)-8\sin\left(x\right)\cos\left(x\right)-3\cos^2\left(x\right)$

$\left(1+u\right)^5$

$\lim_{x\to\infty}\left(-6x^4+5x^3-3x^2-5x+1\right)$