Evaluate each of the following:
sec
can be written as sec
Also, we know sec(2π –θ ) = sec(θ)
∴ sec
= sec
∴ Now the given equation can be written as sec–1sec
As sec–1(sec x) = x
Provided x ϵ [0,π]–
∴ we can write sec–1sec
as 
.
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