Qualification > Math

Complex number help

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Monopoly:

--- Quote from: astarmathsandphysics on November 17, 2010, 10:30:35 am ---R=sqrt((2cos 2pi/3)^2+(2sin 2pi/3)^2) =2 ang arg =2pi/3 etc

--- End quote ---

didn't get this part...

another question
-------> a + bi is called the cartesian form
-------> r(cos theta + i sin theta) is called the modulus-argument form
-------> |u|eitheta is the polar form?

Monopoly:
oh when they ask to sketch locus like |z-a|=k, i have difficulty to draw a god circle. So, it is necessary that the circle should be completely round?
Do i need to use a compass and make accurate drawings like the circle and in drawing perpendicular bisectors in case of l z-a l=l z-b l ?

Also, which locus are included for the CIE A2 maths syllabus. It will be really helpful if they are listed.

thanks

Monopoly:
someone?

Monopoly:
  :(

astarmathsandphysics:
When they say sketch they mean circle like, not an artist' drawing. A VERY ROUGH SKETCH

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