2/7*log((prod_{j=0}^{21}cos((2+4*j)*pi/180))/(prod_{k=1}^{89}cos(k*pi/180)))/log(2)2/7*log((prod_{j=0}^{21}cos((2+4*j)*pi/180))/(prod_{k=1}^{89}cos(k*pi/180)))/log(2)

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