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January 31st, 2008, 01:21 AM   #1
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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
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January 31st, 2008, 02:04 AM   #2
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What are you trying to find?
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January 31st, 2008, 02:33 AM   #3
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I try to check if a given point is lcoated on the great circle
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January 31st, 2008, 10:30 AM   #4
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If tan(a) = b, a = arctan(b) ± some multiple of pi.
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