$25b^2+35b^4-45b^5$

$\lim_{x\to0}\left(\frac{in\:x}{\sqrt{x}}\right)$

$\left(-4+2i\right)\left(4-4i\right)$

$\frac{\sin\left(3u\right)\cos\left(u\right)-\sin\left(u\right)\cos\left(3u\right)}{\sin\left(u\right)\cos\left(u\right)}$

$-2\left(x-20\right)=10$

$x^2+4+5y^3+2x^2-2x^2-6+1$

$\left(-x-.5\right)^2$