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Evaluate each of the following:cos-1(cos 4) |
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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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