limit trigonometri dan limit tak hingga aljabar

 $\lim_{x\rightarrow\infty}\ \frac{1-2x+2x^3}{x^3+x+1}=\ ...$  

 $\lim_{x\rightarrow\infty}\ \frac{3x^2+x+2}{x^3+2x^2+1}\ =\ ...$  

 $\lim_{x\rightarrow0}\ \frac{2x}{\cos\ x}$  

 $\lim_{x\rightarrow0}\ \frac{\sin\ 6x\ .\ \tan\ 3x}{8x^2}$  

 $\lim_{x\rightarrow0}\ \frac{1-\cos^2\ 2x}{3x.\ \tan\ 2x}$  

 $\lim_{x\rightarrow0}\ \frac{\sin\ 3x\ +\ \tan\ 4x}{5x}$  

 $\lim_{x\rightarrow0}\ \frac{1-\cos\ 4x}{\left(3x\right)^2}=$  

 $\lim_{x\rightarrow\ \frac{1}{4}\pi}\ \frac{\cos\ 2x}{\cos\ x\ -\ \sin\ x}=$  

 $\lim_{x\rightarrow2}\ \frac{\sin\left(x-2\right)}{2x-4}=$  

 $\lim_{x\rightarrow3}\ \frac{\sin\left(2x-6\right)}{x^2\ -9}=$