# complex number

Discussion in 'Math' started by pot, Nov 15, 2015.

1. ### pot Thread Starter New Member

Nov 9, 2015
9
0
hi

how I can collect this number use my hand and calculator "fx-991ES"?
complex number

2. ### Papabravo Expert

Feb 24, 2006
10,340
1,850
There might be a missing symbol in the expression. The first number is a plain or real number.

$e^{0.00931} = 1.009$

For the second expression you can use the Euler Identity

$e^{jx}=cos(x)+j sin(x)$

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3. ### WBahn Moderator

Mar 31, 2012
18,088
4,917
Can you do it without a calculator? Or are you relying on the calculator being a brain substitute?

You calculator supports polar entry of complex numbers. Converting your expression above to polar is trivial

Magnitude = e^0.00931

Look at your owner's manual for how to enter the values:

http://support.casio.com/storage/en/manual/pdf/EN/004/fx-115_991ES_PLUS_C_EN.pdf

Look on page 25.

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4. ### Papabravo Expert

Feb 24, 2006
10,340
1,850
I hadn't thought of an implied multiplication!

$e^{0.00931} \cdot e^{j0.3730} = e^{0.00931+j 0.3730}$

Duh!

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