Answer :

cos–1(cos x) = x


Provided x ϵ [0,π] ≈ [0,3.14]


And in our equation x is 4 which does not lie in the above range.


We know cos[2π – x] = cos[x]


cos(2π – 4) = cos(4)


Also 2π–4 belongs in [0,π]


cos–1(cos 4) = 2π–4


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