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

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

and list them in increasing order.

 Feb 13, 2022
 #1
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Do you know what y=cos(x) looks like?

Graph it on desmos if you do not know..     

What is its period?

Where does it first cross the x axis?

https://www.desmos.com/calculator/xbk6uv697u

 

Try drawing cos(12x)   how does it compare?

Try drawing them, discuss it here, if you have specific questions then ask with a new post on this thread.

 Feb 13, 2022

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