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If cos^(-1)[(cos alpha+ cos beta)/(1+cos...

If `cos^(-1)[(cos alpha+ cos beta)/(1+cos alpha cos beta)]=2 Tan^(-1)x` then x=

A

`"tan"(alpha)/(2)"tan"(beta)/(2)`

B

`tan alpha tan beta`

C

`"cot"(alpha)/(2)"cot"(beta)/(2)`

D

`cot alpha cot beta`

Text Solution

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The correct Answer is:
A
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