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simplify[(cos(x-4*pi/3)-sin(x)/2+cos(x-5*pi/6)+sin(x-7*pi/6))/sin(pi/2-x)]
simplify[(cos(x-4*pi/3)-sin(x)/2+cos(x-5*pi/6)+sin(x-7*pi/6))/sin(pi/2-x)]
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