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[" is "1],[" (a) "1],[[" If "cos x=tan y...

[" is "1],[" (a) "1],[[" If "cos x=tan y,," cos "y=tan z,cos z=tan x," then the valued "],[sin x" is "," (a) "2cos18^(@)," (b) "cos18^(@)," (c) "sin18^(@)]]

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