Do you mean
Sin(pi/2) = 1
or
[Sin(pi)] /2 = 0.0274....
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1/2
As tan(x)=sin(x)/cos(x) and sin(pi/4) = cos(pi/4) (= sqrt(2)/2) then tan(pi/4) = 1
The question is ambiguous and the two possible answers are: sin(pi)/3 = 0 and sin(pi/3) = sqrt(3)/2 It is assumed, of course, that since the angles are given in terms of pi, they are measured in radians and not degrees!
Sin(pi/6) = 1/2 is a true statement [not pie].
2*pi is one complete revolution, i.e. 360 degrees. Sin of 2*pi = sin 360º = 0