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

[" If "f:R rarr R," where "f(x)=ax+cos x" and "f(x)" is bijective,then "],[[" (A) "a in R," (B) "a in R^(+)],[" (C) "a in R]]quad [" (D) "a in R-(-1,1)],[" (C) "a in R]

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