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$\cot 7 {\frac{1}{2}}^{o} =$

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detailed solution

Correct option is B

cotθ=1+cos2θsin2θ=1+cos15osin15o where θ=712∘ =1+3+1223-122=22+3+13-1=22+3+13+13-13+1=26+22+3+3+3+12=2+3+4+6

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$\cot 7 {\frac{1}{2}}^{o} =$