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anonymous
 5 years ago
expresss complex number in rectangular form
\[\sqrt{7}*cis*2.1 \]
anonymous
 5 years ago
expresss complex number in rectangular form \[\sqrt{7}*cis*2.1 \]

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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0yes it is stupid notation for \[cos(\theta)+i sin(\theta)\]

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0im trying square of 7 which is 2.64 times cos but cos(?)

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0i also assume that you are working in radians, not degrees. So just use a calculator. \[\sqrt{7} [cos(2.1)+i sin(2.1)]\]

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0i get 1.336 for a and 2.284 for b (rounded) so answer is 1.336 + 2.284 i

amistre64
 5 years ago
Best ResponseYou've already chosen the best response.0the cosine part relates to the x coord; the i sin part relates to the y coord right?

amistre64
 5 years ago
Best ResponseYou've already chosen the best response.0Did the others parse it tight to be: cos(2.1) + i sin(2.1)?

amistre64
 5 years ago
Best ResponseYou've already chosen the best response.0(1.34, 42.30) is what i get with radian measurements...

amistre64
 5 years ago
Best ResponseYou've already chosen the best response.02.28.. musta hit a wrong buttononthe calc :)

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0yes cosine is x and sine is y, usually written as a and b as in a + bi. I doubt it is (1.34,42.3) for two reasons: the rectangular form of a complex number is a number, not a coordinate. so it should look like a + bi also we know that the absolute value of that number is \[\sqrt7\]

amistre64
 5 years ago
Best ResponseYou've already chosen the best response.0correct, its similar to polar coordinates in that respect. But i think the exercise here is to see that complex numbers are nothing new and that they can be plotted in the same manner as rectangular coords...right?
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