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If cos theta =(cos alpha - cos beta)/( 1...

If `cos theta =(cos alpha - cos beta)/( 1- cos alpha cos beta),` then one of the values of `tan ((theta )/(2)) `is ..............
A) `pm tan "" alpha /2 cot "" beta/2 ` B) `tan alpha tan "" beta/2` C) `pm tan ""beta/2 cot "" alpha/2` D) `tan ^(2) "" alpha/ 2 tan ^(2)"" beta/2`

A

`pm tan "" alpha /2 cot "" beta/2 `

B

`tan alpha tan "" beta/2`

C

`tan ""beta/2 cot "" alpha/2`

D

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

Text Solution

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The correct Answer is:
A
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