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

`cot alpha`

D

`sin ((x+y)/(2))`

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HIMALAYA PUBLICATION-MEASUREMENT OF ANGLES, TRIGONOMETRIC RATIOS AND RELATION BETWEEN SIDES AND ANGLES OF A TRIANGLE-QUESTION BANK
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