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   a trig question
Posted:
Mar 22, 2013 1:59 PM


Consider the following two trig.equations.
s = (sin 5D)^(2/5) (1)
c = (cos 5D)^(2/5) (2)
where s and c are real numbers such that 0< c < 1 and 0<s<1; 0< D < pi/2
Statement: Both s and c cannot be rational.
Any helpful comment about the correctness of the statement and appropriate reference will be appreciated.



