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[" If "f(x)=(1-x)/(1+x)," then "f(f cos2...

[" If "f(x)=(1-x)/(1+x)," then "f(f cos2 theta)]" equal to "],[[" (a) "tin2 theta," (b) soc "2 theta," (c) "cos2 theta," (d) cot "2 theta]]

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