Inverse tan

[andy]

Is there anyway to use the inverse tan or tan-1 function in qb. If not, how can I work out the size of an angle, when I only know two other sides.

[Lachie Dazdarian]

tan(theta) = a/b = theta in radians (aproximately)

Doesn't apply on sin or cos functions. I mean you need to have small angles if you want to aproximate the angle on that way.

[Neo]

Use the ATN function, it is the function that calculates the arc tangens.

For ARCCOS and ARCSIN, they can be rewritten into LN, e powers and LOGs.

[Dj Dennie]

In case you need other trig functions try this:
http://support.microsoft.com/support/kb/...8/2/49.asp

[andy]

Thanks guys. The site that DJ dennie posted was really helpfull.