Let 0 le a,b,c,d le pi where b,c are no...

Let `0 le a,b,c,d le pi` where b,c are not complementary such that 2cosa + 6cos b + 7cosc + 9cosd = 0 and `2sina-6sinb + 7 sinc-9sind=0` .Then the value of `(cos(a+d))/(cos(b+c))` =

A

`1//3`

B

`3//4`

C

`5//4`

D

`7//3`

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The correct Answer is:

D

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