S slip Member Joined Mar 4, 2004 Messages 543 Location newcastle Gender Male HSC 2004 Mar 13, 2004 #1 for the value of pie on 2 is cos2x equal to a) 2 x cos (pie/2) or b) cos (pie)
C CM_Tutor Moderator Moderator Joined Mar 11, 2004 Messages 2,642 Gender Male HSC N/A Mar 13, 2004 #2 When x = pi / 2, cos 2x = cos (2 * pi / 2) = cos pi = -1 So, B.
S slip Member Joined Mar 4, 2004 Messages 543 Location newcastle Gender Male HSC 2004 Mar 13, 2004 #3 thanks
