Q.

If cos-1cosα+cosβ1+cosα cosβ=2Tan-1x then x=

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a

tanα2tanβ2

b

cotα2 cotβ2

c

cot α cot β

d

tanα tanβ

answer is A.

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Detailed Solution

Let  a=tan2 α2  ,  b=tan2 β2 cos-11-a1+a+1-b1+b1+1-a1+a·1-b1+b=cos-11+b-a-ab+1+a-b-ab1+a+b+ab+1-a-b+ab =cos-12-2ab2+2ab=cos-11-ab1+ab=2tan-1 ab =2tan-1tan α2 tan β2   x=tan α2  tan β2 

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