# complex number

#### pot

Joined Nov 9, 2015
9
hi

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

#### Papabravo

Joined Feb 24, 2006
12,389
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

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

• pot

#### WBahn

Joined Mar 31, 2012
24,684
hi

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

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.

• thumb2 and pot

#### Papabravo

Joined Feb 24, 2006
12,389
I hadn't thought of an implied multiplication!

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

Duh!

• pot