July 2nd, 2017, 08:37 PM  #1 
Newbie Joined: Jun 2017 From: vancouver Posts: 3 Thanks: 0  Inverse Trig problem
arcsine(sin(3pi/4)) I got pi/4 as the answer, but it's incorrect Can anyone help? Last edited by skipjack; July 2nd, 2017 at 10:34 PM. 
July 2nd, 2017, 10:33 PM  #2 
Global Moderator Joined: Dec 2006 Posts: 19,188 Thanks: 1648 
sin(3$\pi$/4) = sin($\pi$/4) = 1/√2, so arcsin(sin(3$\pi$/4)) = $\pi$/4, not 3$\pi$/4.


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