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[" 30."cos x=tan y," cosy "=tan z,cos z=...

[" 30."cos x=tan y," cosy "=tan z,cos z=tan x" then the value of "sin x" is ".....],[[" 1) "2cos18^(@)," 2) "cos18^(@)," 3) "2sin18^(@)," 4) "sin18^(@)]]

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