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hermom1967
 one year ago
Please help explain what I did wrong
Express the complex number in trigonometric form. 2i
hermom1967
 one year ago
Please help explain what I did wrong Express the complex number in trigonometric form. 2i

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hermom1967
 one year ago
Best ResponseYou've already chosen the best response.0I got 2(cos 90° + i sin 90°) but that was wrong and I don't understand why.

myininaya
 one year ago
Best ResponseYou've already chosen the best response.1ok cos(90 deg)=0 and sin(90 deg)=1 so you have 2(0+i*1) 2(i*1) 2(i) 2i

myininaya
 one year ago
Best ResponseYou've already chosen the best response.1why don't you just change 2 to 2

myininaya
 one year ago
Best ResponseYou've already chosen the best response.1or you could go with changing the angle from 90 deg to 270 deg since sin will be negative 1there

myininaya
 one year ago
Best ResponseYou've already chosen the best response.1let me know if you need more assistance @hermom1967

hermom1967
 one year ago
Best ResponseYou've already chosen the best response.0So it would be 2(cos 270° + i sin 270°)?

hermom1967
 one year ago
Best ResponseYou've already chosen the best response.0Is that because it's in a different quadrant?

myininaya
 one year ago
Best ResponseYou've already chosen the best response.1right since cos(270 deg)=0 and sin(270 deg)=1 so you would have 2(0+i[1]) =2[i[1]] =2[i] =2i

myininaya
 one year ago
Best ResponseYou've already chosen the best response.1also have you ever graphed things in the form a+bi?

myininaya
 one year ago
Best ResponseYou've already chosen the best response.1we have a is 0 which means we don't go left or right any but b is 2 which means we have to go down 2 units

myininaya
 one year ago
Best ResponseYou've already chosen the best response.1dw:1432867663223:dw

hermom1967
 one year ago
Best ResponseYou've already chosen the best response.0Okay, I understand that

myininaya
 one year ago
Best ResponseYou've already chosen the best response.1you can think of a+bi as if you are plotting points (a,b)

myininaya
 one year ago
Best ResponseYou've already chosen the best response.1you know when graphing

myininaya
 one year ago
Best ResponseYou've already chosen the best response.1dw:1432867746418:dw

myininaya
 one year ago
Best ResponseYou've already chosen the best response.1and yeah you could have chose the angle to be 90 deg if you made r negative like you could have done 2(cos(90)+isin(90))

hermom1967
 one year ago
Best ResponseYou've already chosen the best response.0Okay, thank you so much! Now to be able to retain that... LOL

myininaya
 one year ago
Best ResponseYou've already chosen the best response.1I think it will get a little easier when you guys go over plotting things in form a+bi or plotting also polar coordinates, you know where you plot things in the form (r,theta)
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