## Fundamental period of a signal

Hi all,

First post here for me.

1. Problem Statement

Find the fundamental period of:
3cos(1.3PiN) - 4sin(0.5piN +0.5Pi)

2. Relevant equations:
T = 2PI / w

3. My attempt:
Not sure how to proceed. By themselves the fundamentals period would be:
3cos(1.3PiN)

w = 1.3Pi thus T = 2/1.3

4sin(0.5piN +0.5Pi)

w = 0.5pi thus T = 2/0.5

However, I need to combine the equation somehow? It has been a long time since I had calculus and I do not remember.

Thanks
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