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December 14th, 2006, 12:01 PM  #1 
Member Joined: Nov 2006 From: BIG APPLE Posts: 63 Thanks: 0  Evaluation Help
Evaluate: sec(3pi/4)  cot pi/2 
December 14th, 2006, 12:10 PM  #2 
Senior Member Joined: Dec 2006 Posts: 1,111 Thanks: 0 
This problem is pretty easy. The answer is (sqrt 2). This is because the cot pi/2=0 and the sec(3pi/4)= (sqrt 2) 
February 3rd, 2007, 06:33 AM  #3 
Global Moderator Joined: Dec 2006 Posts: 20,819 Thanks: 2158  Tip on calculating with Google Calculator
Did you know that you can have Google evaluate simple expressions for you? You get just a plain number, but that's enough to help you. Note, however, that you must use parentheses correctly. Also, Google recognizes cotangent and ctan, but not cot. For the above expression, just give sec(3pi/4)  ctan (pi/2) to Google and sec(((3 * pi)) / 4)  ctan(pi / 2) = 1.41421356 is promptly returned. 

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