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Find the value of cos^-1(cos(2cot^-1(√2 - 1)))

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Find the value of cos-1(cos(2cot-1(√2 - 1)))

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We have

cos-1(cos(2cot-1(√2 - 1)))

by (10 points)
I want to ask that
How -1 came in 2nd step
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Plzz explain 2nd step
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