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Question: Error, cannot determine if this expression is true or false

Question:Error, cannot determine if this expression is true or false

mkj256 40 Maple
error conditional
June 02 2014
3

i am trying to execute the following code but i am having the following error:

A:=Matrix(21,4):A(1,2):=0:A(2,2):=0:t:=2: thetasec:=-8.724679300*10^(20): for z from 0.1 by 0.05 to 1 do t:=t+1: A[t,1]:=z: x:=2*A[t-1,2]-A[t-2,2]+thetasec*0.05^(2): theta2:=evalf(arctan(sin(x-Pi),cos(x-Pi))+Pi): if theta2>Pi/(2)and theta2<=(3*Pi)/(2)then A[t,2]:=theta2-Pi elif theta2>(3*Pi)/(2)then A[t,2]:=theta2-2*Pi else A[t,2]:=theta2 fi: A[t,3]:=cos(A[t,2]): A[t,4]:=sin(A[t,2]):

A:=Matrix(21,4):A(1,2):=0:A(2,2):=0:t:=2: thetasec:=-8.724679300*10^(20):  for z from 0.1 by 0.05 to 1 do  t:=t+1: A[t,1]:=z:  x:=2*A[t-1,2]-A[t-2,2]+thetasec*0.05^(2):  theta2:=evalf(arctan(sin(x-Pi),cos(x-Pi))+Pi):    if theta2>Pi/(2)and theta2<=(3*Pi)/(2)then   A[t,2]:=theta2-Pi   elif theta2>(3*Pi)/(2)then A[t,2]:=theta2-2*Pi else  A[t,2]:=theta2 fi:  A[t,3]:=cos(A[t,2]):  A[t,4]:=sin(A[t,2]):od

Error, cannot determine if this expression is true or false: (1/2)*Pi < 3.535344555 and 3.535344555 <= (3/2)*Pi

what is causing this error and how can i fix it 

 
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