Arctan to radians.. need help asap..
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Arctan to radians.. need help asap..

[From: ] [author: ] [Date: 12-11-20] [Hit: ]
so heres my problem..I have these 2 problems: phi = arctan (2/3) = .phi = arctac(-8/1) = -1.My question is that how do you get .588 and -1.......
Hello experts,

ok, so heres my problem..
I have these 2 problems: phi = arctan (2/3) = .588 rad
and
phi = arctac(-8/1) = -1.446 rad

My question is that how do you get .588 and -1.446? Can someone please explain me this carefully?

by the way we are allowed to use calculator on tomorrows exam but i dont know how to get those number using the calculator.. I have a Ti-Nspire.. Any help would be great.
thanks a lot

-
arc tan ... is the inverse function of tan

so on an older calculator you punch the number in first..

so you type...

2
then /
then 3

then inverse button ' INV" or SECOND FUNCTION putton for the function above the key

then TAN KEY

============

make sure it is in RADIANS MODE not decimal

you can press the DRG button to change modes I think


=============

the second one same thing


8
then -/+
then second function or INV key
then TAN

that is all there is to it..

-
you need to use the calculator to find these angles

depending on your calculator, it will be 2nd tan or inverse tan (but should have the symbol tan^-1

tan^-1 (2/3) = .588 (from calculator)
tan^-1 (-8) = -1.446 (from calculator)

make sure you're in radians mode if that's what is being asked for
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