# is there a CIS button on graphic calculators (Casio/TI)

Is there a cis (CosX + iSinX) Button in CASIO graphic calculators ? if so where its ? if no is there any turn around for it ?

PS. I got a CASIO fx-9860G

Thanks

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I have the CFX-9850G, awesome calculators! :) –  FundThmCalculus Dec 10 '14 at 3:41

So, entering 2∠30 is equivalent to entering $2\text{ cis }30°$.

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Cheers!!! Thanks alot ! –  omeid Mar 13 '11 at 13:14
Plus one for RTFM! –  Milo Jun 26 '14 at 7:47

$\text{cis}(x)$ is equal to $e^{ix}$.

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Thanks for your answer I tried to put e^i(n) and it returns error on Casio. :( –  omeid Mar 2 '11 at 6:04
Have you turned on complex mode on the calculator? (Set up $\to$ Complex Mode). When does it return an error? In the graph mode? –  please delete me Mar 2 '11 at 7:14

My answer outlines the method as to how to convert between polar and rectangular form on a normal scientific Casio calculator. For reference, I'm using my fx-82MS calculator. Whilst this isn't directly related to the question asked, I feel that it should still fit in here.

To convert from rectangular form to polar form on the calculator, press the $\text{Pol(}$ which should be located just under the mode button. And type in $a,b$ and close brackets. $a$ is the real part of your complex number and $b$ the imaginary part. For example, to convert $1 + i$ to polar form, you would enter $$\text{Pol}(1,1)$$ and the screen would display $1.4142135... = \sqrt{2}$. This is the modulus of your complex number. To get the angle, press $\text{RCL}$ and the $F$ key, or the $\tan$ key. The calculator then displays $45^{\circ}$.

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