Evaluate each of the following:
cot
can be written as cot
we know cot(π +θ ) = cot(θ)
∴ cot
= cot
Now the question becomes cot–1(cot
)
cot–1(cot x) = x
Provided x ϵ (0,π)
∴ cot–1(cot
) = 
.
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