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if the first derivative of f(x) =log2(lo...

if the first derivative of `f(x) =log_2(log_3(log_(1/2)(cos x+a))) `exists `AA x epsilon R`, ,then : A. `a in (1,3/2)` B. `ain(1/2,1)` C. `a in(1,5/2)` D. `a in {phi}`

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