Q 1444891753.     If the lines `2(sin a+sin b)x-2sin(a-b)y=3 ` and

`2 (cos a + cos b) x + 2 cos (a- b) y = 5` are perpendicular,

then `sin 2a + sin 2 b` is equal to

A

`sin(a- b)- 2sin(a +b)`

B

`sin(2a- 2b)- 2sin (a+ b)`

C

`2 sin(a b)- sin(a +b)`

D

`sin (2a- 2b)- sin (a+ b)`

HINT

If line are `bot` `m_1xxm_2 = -1`

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