$\lim_{x\to0}\left(x^4\sin\left(\frac{\pi}{x}\right)\right)$

$\left(y-1\right)=\left(3x^2+4x+2\right)$

$\frac{5}{x-3}-\frac{7}{x-2}+\frac{2}{x-1}$

$x^{-3}\left(2x-3\right)$

$\frac{\left(1+tan^2\left(b\right)\right)}{tan^2\left(b\right)}$

$\left(\frac{2}{3}x+1\right)^2-\left(\frac{2}{3}x+1\right)-20=0$

$301x=3$