# Math Help - Finding a differential.

1. ## Finding a differential.

i is sqrt(-1) and z is a complex number,d stand for differential
prove:if z-i=e^(it),then dz=ie^(it)dt

2. ## Re: A simple question,please reply

Differentiate both sides with respect to t... i is a constant.

3. ## Re: A simple question,please reply

please show steps because i forgot how to do differential

4. ## Re: A simple question,please reply

$\dfrac{d}{dx} e^{ax} = ae^{ax}$

It's an application of the chain rule and the special case of e.