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which of the following is /are correct? ...

which of the following is /are correct?
`(A) cos72^(0)=(sqrt(5)-1)/(4) `
`(B) sin54^(0)=(sqrt(5)-1)/(4)`
`(C) cot7(1)/(2)^(0)=sqrt(2)+sqrt(3)+sqrt(4)+sqrt(6)`
` (D) 4sin27^(0)=sqrt(5+sqrt(5))+sqrt(3-sqrt(5))`

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