If sin x+7cos x=5 ,then cos(x-phi)=(1)/(...

If `sin x+7cos x=5` ,then `cos(x-phi)=(1)/(sqrt(2))` where
(A) `cos phi=(7)/(sqrt(50))`
(B) `cos phi=(7)/(sqrt(75))`
(C) `sin phi=(1)/(sqrt(50))`
(D) `sin phi=sqrt((26)/(75))`

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