1.

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

Answer»

`"tan"(ALPHA)/(2)"tan"(BETA)/(2)`
`tan alpha tan beta`
`"cot"(alpha)/(2)"cot"(beta)/(2)`
`cot alpha cot beta`

ANSWER :A


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