# Differential Equation, Rewriting solution

## Homework Statement (also express C and alpha as functions of A and B)

I need help with the second part (rewriting the solution).

## Homework Equations

e = cos(θ) + jsin(θ)

## The Attempt at a Solution

Unfortunately, I can't think of how to even begin solving. I have the notion that I have to combine the two terms into one, however the A and B constants prevent me from doing so. Can someone point me in the right direction?

Thanks

#### Attachments

Chestermiller
Mentor
Have you been able to do the first part?

Have you been able to do the first part?

Yes, I have already done the first part. I did do it backwards, however, because I do not know how to solve differential equations (second derivative ---> function) yet.

Chestermiller
Mentor
Yes, I have already done the first part. I did do it backwards, however, because I do not know how to solve differential equations (second derivative ---> function) yet.
Then by the same backwards approach, do you know the trigonometric identity for the cosine of the sum of two angles?

• ecoo
Then by the same backwards approach, do you know the trigonometric identity for the cosine of the sum of two angles?

Thanks for the help