1.

Ifz=re^(itheta), then |e^(iz)|is equal to

Answer»

`E^(-rcostheta)`
`e^(rcostheta)`
`e^(rsintheta)`
`e^(-rsintheta)`

SOLUTION :`because z=re^(itheta)=R(costheta+isintheta)`
`IMPLIES IZ=r(-sintheta+icostheta)`
`=e^(iz)=e^(-rsintheta).e^(ircostheta)`
`implies|e^(iz)|=e^(-rsintheta)`


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