I have hard time with trig

Find the 3 smallest positive x-intercepts of the graph of

y = cos 12x + cos 16x + cos 20x

and list them in increasing order.

Guest Jan 27, 2023

#1**0 **

Since you are looking for an x intercept you can set y = 0

this looks like trig identities

https://www2.clarku.edu/faculty/djoyce/trig/identities.html should help

YourAverageDummy Jan 27, 2023