[50G] Question

[Tugdual]

(05-01-2015 05:29 PM)Gilles Wrote:  

(05-01-2015 05:09 PM)Tugdual Wrote:  Just found that the 50g doesn't seem to know the equivalence in between complex exponential and sin/cos. For example the following equation doesn't evaluate to zero.
$$cos(x)+i.\sin { \left( x \right) } -{ e }^{ i.x }$$

Is there a special setting to define that? I find that disturbing to say the less...

Hi, you can do :

$$cos(x)+i.\sin { \left( x \right) } -{ e }^{ i.x }$$

LIN : RShift ALG = Linearize expression involving exponential terms
-> 0

or

EXPLN EVAL
-> 0

EXPLN : LShift EXP&LN = Transform trigonometric term to exponential and logarithm

Thanks Gilles. Just found the SINCOS function that does all the magic...
It is not documented in the user guide, only in the advanced user guide.

Anyway the two functions to remember are EXPLN and SINCOS.