1. (       dx       
   |   \/(4 - x²)
   )
   hint
   answer
   
2. (      x + 2     dx       
   |   \/(4 - x²)
   )
   hint
   answer
   
3. (     2e^2x dx
   |     e^2x - 1
   )
   hint
   answer
   
4. (     3x³ - 2  dx       
   |     x² + 4
   )
   
   hint
   answer
   
5. (          dx       
   |   x² - 4x + 7
   )
   
   hint
   answer
   
6. (           dx        
   |   2x² - 3x + 9
   )
   
   hint
   answer