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# Trig question

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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.

Jan 27, 2023

#1
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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

Jan 27, 2023
#2
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I think I'll wait and get advice from someone who doesn't completely $$\text{su} \text{ck}$$ at math.

Guest Jan 28, 2023
#3
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As follows:

Jan 29, 2023