Question 389270
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Hi,         
f(x)= 2 sin x
x = {{{5*pi/6}}}
f({{{5*pi/6}}}) = 2 sin{{{5*pi/6}}}= 2* 1/2 = 1
Might find the following (cosx, sinx) presentation to be useful to You
<img src="http://www.math.ucsd.edu/~jarmel/math4c/Unit_Circle_Angles.png">