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[" If "cos x=tan y,cos y=tan z" and "cos...

[" If "cos x=tan y,cos y=tan z" and "cos z=tan x," then "sin x" equals "],[[" (A) "2cos18^(@)],[" (B) "cos18^(@)],[" (C) "sin18^(@)],[" (D) "2sin18^(@)]]

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