$\left(b-4\right)\left(b+6\right)$

$\lim_{x\to\infty}\frac{1}{\left(0.9\right)^x}$

$\frac{\sin\left(x\right)+1}{\sin\left(x\right)}\cdot\frac{\cos\left(x\right)+1}{\cos\left(x\right)}=1$

$\lim_{x\to0}\left(\frac{x+sen\left(x\right)}{x-cos\left(x\right)}\right)$

$9x^2+72x+144$

$\int\left(sin^4\left(8q\right)cos\left(8q\right)\right)dq$

$4x^2y^2+8x^3y^5$