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

$\left(2-3i\right)+\left(-2+3i\right)$

$12x^2-20x^2y^2-8xy^3$

$\frac{\sin\theta+\cos\theta}{\sec\theta+\cos ec\theta}=\frac{1}{2}\sin2\theta$

$v+9=8$

$x^2+x+6$

$-9+7+3-5-9+14+16-17-2-5$