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[" 28.If "tan alpha=(1)/(7),tan beta=(1)...

[" 28.If "tan alpha=(1)/(7),tan beta=(1)/(3)," then "cos2 alpha" is equal to "],[[" (a) "sin2 beta," (b) "sin4 beta],[" (c) "sin3 beta," (d) "cos2 beta]]

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