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`(cos21^(@) -sin21^(@))/(cos21^(@) + sin21^(@))` A)`tan21^(@)`B)`cot66^(@)`C)`tan42^(@)`D)`cot42^(@)`

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`(cos21^(@) -sin21^(@))/(cos21^(@) + sin21^(@))` A)`tan21^(@)`B)`cot66^(@)`C)`tan42^(@)`D)`cot42^(@)`
A. `tan21^(@)`
B. `cot66^(@)`
C. `tan42^(@)`
D. `cot42^(@)`
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Correct Answer - B
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