sin (-11pi/6)=sin (-12pi/6+pi/6)=sin (-2pi+pi/6)=sin(pi/6)=1/2
sin(-11pi/6)=sin(-12pi/6+pi/6)=sin(-2pi+pi/6)=sin(pi/6)=1/2
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sin (-11pi/6)=sin (-12pi/6+pi/6)=sin (-2pi+pi/6)=sin(pi/6)=1/2
sin(-11pi/6)=sin(-12pi/6+pi/6)=sin(-2pi+pi/6)=sin(pi/6)=1/2