phy1020.DVI

• When taking an inverse trigonometric function, there will in general betwocorrect values; your cal-
  culator will give only one value, theprincipal value(P.V.). The other value is found using the table
  below.

Function P.V. Other value

arcsin 

arccos  

arctan C

arcsec  

arccsc 

arccot C

For arctan.y=x/, addto the calculator’s principal value answer ifx<0.