$18+5\left(1.6\right)+8$

$\lim_{x\to0}\left(\frac{\sin\left(5x\right)-\sin\left(3x\right)}{\sin\left(x\right)}\right)$

$3x-8>13$

$\int\frac{\left(x^2+3x+10\right)}{x^3+x+3x^2+3}dx$

$\frac{dy}{dx}\left(1+x+y^2+xy^2\right)$

$27^x=9^{x-2}$

$c=\left(\senx+2\cos x\right)^{2}+\left(2\senx-\cos x\right)^{2}$