[" 6.If "tan alpha=(1)/(7)" and "tan bet...

[" 6.If "tan alpha=(1)/(7)" and "tan beta=(1)/(3)," then "cos2 alpha" is "],[" equal to "],[[" 1) "sin2 beta," 2) "sin4 beta," 3) "sin3 beta," 4) "cos2 beta]]

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