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maximize ((2*9.87*cos(4*pi*(x-81)/365) - 7.67*cos(2*pi*(x-81)/365-1.37357412))), x>0,x<=365
maximize ((2*9.87*cos(4*pi*(x-81)/365) - 7.67*cos(2*pi*(x-81)/365-1.37357412))), x>0,x<=365
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