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[" 12.If "f:R rarr R" where "f(x)=ax+cos...

[" 12.If "f:R rarr R" where "f(x)=ax+cos x," if "f" is "],[" bijective,then "],[[" 1) "a in R," 2) "a in R^(+)],[" 3) "a in R^(-)," 4) "a in R-[-1,1]]]

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