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sashman

Sat Apr 23, 2005 10:03 am


arctand function

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i'm trying to calculate the tan of an angle in a program i'm making, but the only function in turing is arctan and arctand, but those are just inverse tan.  arctand would give me the angle, but i already have the angle.  What i need is  the calculate the tan of an angle.


e.g.              arctand (root(3)) = 60

what i need is            tan (60) = root(3)

is ther a function in turing that's simply tan, or do i have to do make some wierd combination. thanks for your help.


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Cervantes

Sat Apr 23, 2005 10:28 am



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Turing 4.0.5 has tan and tand.  I'm not sure, but I seem to remember something about previous versions having tan, just that it's not documented.

Anyways, here's some math:

tan (theta) = sin (theta) / cos  (theta)

sin (theta) = y/r
cos (theta) = x/r

sin (theta) / cos (theta) = (y/r) / (x/r) = (y/r) * (r/x) = y/x = tan (theta)


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sashman

Sat Apr 23, 2005 10:54 am



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sweeet it works.  thanks for the help