Question: Prove Acos ( 2 k 1 n + ) = Acos ( 2 n k 2 n + ) k 2 = k 1 +

Prove
Acos(2k1n+)=Acos(2nk2n+)
k2=k1+2m.
Prove Acos ( 2 k 1 n + ) = Acos ( 2 n k 2 n + ) k

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