$sin\left(3x\right)=0.3$

$-9\cdot25\cdot n^2$

$\frac{dy}{dx}=2xy+3x-4y+6$

$\left(\frac{xu^{-3}}{3z^{-2}}\right)^2\left(x^3z^{-1}\right)$

$\lim_{h\to0}\left(\frac{2\left(x+h\right)-2x}{h}\right)$

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

$\int\:\:x^3+2\sqrt{x^5}-\frac{3x}{4}-\frac{16}{x^2}dx$