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sqrt(1 - cosA) / sqrt(1+ cosA)
multiply numerator and denominator with
sqrt (1+ cosA)
numerator = sqrt[(1-cosA)(1+cosA)]
=sqrt(1- cos²A) , because (1-a)(1+a)=1²-a²
=sqrt sin²A , because sin²A+ cos²A =1
= sinA
denominator = sqrt(1+cosA)²
= 1+cosA
answer: sinA/(1+cosA)
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