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Prove that cot²A(secA-1) = Cos A
9 years ago

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Steve
sorry - ain't so. Check for typos

However, cot(sec^-1(A)) = √(A^2-1)
cot^2(sec^-1(A)) = A^2-1

I think I can see how the question was mangled. Can you?
9 years ago

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