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If sin 2 theta+sin 2 phi=(1)/(2) and cos...

If `sin 2 theta+sin 2 phi=(1)/(2)` and `cos 2 theta+cos 2 phi=(3)/(2)` then `cos ^(2)(theta-phi)=`

A

`(3)/(8)`

B

`(5)/(4)`

C

`(3)/(4)`

D

`(5)/(8)`

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