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sin(30) = 0.5
Use the Sine rule. If L is the length of the longer leg, then L/sin(60) = 6/sin(30) So that L = 6*sin(60)/sin(30) = 12*sin(60) = 12*sqrt(3)/2 = 10.39 units.
=1/2=0.5
cos 60
Y=sin X is a function because for each value of X, there is exactly one Y value.