Cot a =1 root 3 the find 1-cos^2 a /1+cos^2 a
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cot a=1/root3
therefore a=60°
now cos^2 60°=1/2^2=1/4
1+1/4=5/4
cos^2 60°=1/2^2=1/4
1-1/4=3/4
therefore 3/4÷5/4=3/5
therefore a=60°
now cos^2 60°=1/2^2=1/4
1+1/4=5/4
cos^2 60°=1/2^2=1/4
1-1/4=3/4
therefore 3/4÷5/4=3/5
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