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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)`

Text Solution

Verified by Experts

The correct Answer is:
C
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