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January 31st, 2008, 12:21 AM  #1 
Newbie Joined: Jan 2008 Posts: 2 Thanks: 0  Is it possible to replace in a term tangent by arc tangent?
Hello, I have to transform a mathematical term in that case that it uses arc tangent instead of tangent. Is this possible? If yes, how can I solve my problem? I haven't any idea. Here is the term which should use arc tangent instead of tangent: tan(phi_p) == tan(phi_nnp)*cos(lambda_p  lambda_nnp) Please help me. Thanks me 
January 31st, 2008, 01:04 AM  #2 
Global Moderator Joined: Dec 2006 Posts: 18,847 Thanks: 1568 
What are you trying to find?

January 31st, 2008, 01:33 AM  #3 
Newbie Joined: Jan 2008 Posts: 2 Thanks: 0 
I try to check if a given point is lcoated on the great circle

January 31st, 2008, 09:30 AM  #4 
Global Moderator Joined: Dec 2006 Posts: 18,847 Thanks: 1568 
If tan(a) = b, a = arctan(b) Â± some multiple of pi.


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