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Lil help with trig.

  1. Jun 11, 2009 #1
    http://img132.imageshack.us/img132/8730/222fmf.jpg [Broken]

    what should I care of? what could cause problems to me?
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Jun 11, 2009 #2
    the principal value of arcsine is not a full inverse of sine. Arcsine returns an angle in [-pi/2,pi/2] but x can be any angle. The fact that you book reminded you of is equivalent to saying that sin(x)=sin(y) does not imply that x=y. Take x=0 and y=2*pi for example.
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