>> On a similar note, anybody know why I can't get sage to equate e^
>> (theta*I) == cos(theta) + I*sin(theta) ?
>>
>
>
> I don't know. Sage uses Maxima. Does maxima know Euler's formula?
>
>
I suppose that Sage knows Euler's formula because
sage: var('x')
x
sage: real_part(e^(I*x))
e^(-imag_part(x))*cos(real_part(x))
but :
sage: var('x')
x
sage: assume(imag_part(x)==0)
sage: real_part(e^(I*x))
e^(-imag_part(x))*cos(real_part(x))
seems strange to me.
Does someone know how to make Sage understand that x is real and that
e^(i*x) = cos(x)+I*sin(x) ??
Good afternoon
Laurent
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