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Q.

x=cot6°cot42°,  y=tan66°tan78°  thenyx=

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a

2

b

1

c

4

d

5

answer is B.

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Detailed Solution

x=cot6°cot42°,  y=tan66°tan78°yx=tan6°tan42°tan66°tan78°        =tan6°tan54°tan66°tan18°tan42°tan78°tan54°tan18°       =tan18°tan54°tan54°tan18°   ∵tanθtan60∘-θan60∘+θ=tan3θ     =1
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