Hellooooooo fellow 4 uniter's (2 Viewers)

[seanieg89]

It is a pretty immediate fact from the way the the trig functions and the exponentials are defined in higher mathematics (read about power series if you are really interested).

 

[hup]

there is the noob way of proving it

y = cisx
y' = icisx = iy

dy=iy (dx)
dy/(iy) = dx
integrate and find constant you get

e^ix = cosx + i sinx

 

[AAEldar]

aiight cool but where does the e come from or is this a rule??

?

Google it. Euler's Formula. Easy enough to find a proof of it as well.

 

[b3kh1t]

?

Google it. Euler's Formula. Easy enough to find a proof of it as well.

Aiight thanks mate