Find cosz

If z=i log(2-√3),then find cosz .

1 Answers

Ans) We know that
cos z = (e ^{- iz}+ e^iz) / 2

= [e^i²log (2-âˆš3) + e^{- i ²} log (2 -âˆš3) ] / 1

= [ e log (2-√3)^-1 + e log (2-√3) ] / 2

=[ (2-âˆš3) + (2-âˆš3) ^-1 ] / 2

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