Q 1201312228.     If `sin x + cos y = a and cos x + sin y = b`, then tan `(x−y)/2` is equal to
Select one:

A

`a – b`

B

`(a+b)/(a−b)`

C

`(a−b)/(a+b)`

D

`a + b`

HINT

Use `sinx+siny` & `cosx+cosy` formula by converting them.
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