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Suppose that 'a' is a non-zero real numb...

Suppose that 'a' is a non-zero real number for which `sin x+sin y=a and cos x + cos y= 2a`. The value of `cos(x-y) is`

A

`(3a^(2)-2)/(2)`

B

`(7a^(2)-2)/(2)`

C

`(9a^(2)-2)/ (2)`

D

`(5a^(2)-2)/(2)`

Text Solution

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The correct Answer is:
D
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