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If cos x + cos y + cos alpha = 0 and sin...

If `cos x + cos y + cos alpha = 0` and `sin x + sin y + sin alpha = 0`, then `cot((x+y)/(2))` =

A

`sin alpha`

B

`cos alpha`

C

`tan alpha`

D

`cot alpha`

Text Solution

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The correct Answer is:
D
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SIA PUBLICATION-EAMCET -2016 (TS)-CHEMISTRY
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