Use the ATAN function. Note that all trig functions in Excel use radians,
not degrees.


--
Cordially,
Chip Pearson
Microsoft MVP - Excel
Pearson Software Consulting
www.cpearson.com
(email on the web site)


"Ahsan" wrote in message
...
in trignometry what is the formula for TAN INVERSE. i want to use this
formula in microsoft excel. plz help me out with that formula.
Thanks