How to check analytic function for Cosz || Complex Analysis || 18mat41 || Dr Prashant Patil

In this video, it is check that Cos z is analytic by finding the real and imaginary parts and CR equations
#DrPrashantPatil#ComplexFunctions#18MAT41#Module01#Lecture13
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[@sharanbiradar3615]

Tq sir😊 great explanation

[@ttsa8789]

Nice 😮

[@chiragsingh9166]

Thank you sir.

[@akanmikedavid]

Great video

[@DrPrashantPatil7899]

Thanks!

[@Maneesharma1947]

Nice

[@Mohit_thakur_99]

Describe the Riemann surface defined by w = cosz Is this same answer?

[@Luiscastillo_aa]

how can i get cos (3z)?? btw great video!!

[@DrPrashantPatil7899]

Great you have to multiple by 3 every term of z=x+iy it becomes 3x+i3y then every thing is same but answer i,e derivative will be -3sin3z you are going to get.

[@Luiscastillo_aa]

@@DrPrashantPatil7899 thx a lot man!

[@DrPrashantPatil7899]

@@Luiscastillo_aa you are always welcome and for different topics you can go through playlists.

[@Luiscastillo_aa]

@@DrPrashantPatil7899 hi men i was trying to do it but got stuck in one part at the end. I get -(sin(3x+i3y)) but i don't know how can i get to the answer with it :(

[@DrPrashantPatil7899]

@@Luiscastillo_aa yes you got correct answer only you have to replace back 3x+i3y by 3z over