If cos e c^(-1)(cos e cx) and cos e c(co...

If `cos e c^(-1)(cos e cx)` and `cos e c(cos e c^(-1)x)` are equal functions, then the maximum range of value of `x` is (a)`[-pi/2,-1]uu[1,pi/2]` (b) `[-pi/2,0]uu[0,pi/2]` (c)`(-oo,-1)uu[1,oo]` (d) `[-1,0]uu[0,1]`

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