Establish the identity sec2 ⊖/2= 2/1+cos⊖

2 after sec is an exponent

/ means fraction

sec^2 ⊖/2= 2/1+cos⊖

sec ⊖=1/cos ⊖

sec^2 ⊖/2=1/cos^2 ⊖/2=1/((1+ cos ⊖ )/2)=2/ 1+cos ⊖

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