Transform this function into phasor form

[Moneer81]

Tansform the following function of time into phasor form:

3 cos 600t - 5 sin (600t + 110)

so I need to change the second term to a cosine term, any hints? or can I use a trig indentity that would make things easier?

 

[malawi_glenn]

There are a lot of formulas that can help you. I my self often uses the Euler identities.