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If cos x+ cos y = 1//3 , sin x + sin y=...

If ` cos x+ cos y = 1//3 , sin x + sin y=1//4 " then " cos (x+y)=`

A

`7//25`

B

`24//25`

C

`25//24`

D

`25//7`

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The correct Answer is:
A
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DIPTI PUBLICATION ( AP EAMET)-TRIGONOMETRIC RATIOS AND IDENTITIES -EXERCISE 1 D ( TRANSFORMATIONS )
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