Today:
-  Announcements
	
 -  Last time:
	
	-   we finished with section 
	1.4
	
 -  We began Section
	1.5
		
		
		-  #3 - computing derivatives using the centered difference formula
		
 -  Let's compare with the backward difference.
		
 -  And let's talk about visualizing these....
		
 
		
	 
	
 -  Today 
	
	
	
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