1. (  
   |   ln x dx
   )
   
   hint
   answer
   
2. (        
   |   x cos x dx
   )
   
   hint
   answer
   
3. (  
   |     e^x sin x dx
   )
   
   hint
   answer
   
4. (     
   |    x ln x dx
   )
   
   hint
   answer