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Insanely easy question - trig functions, need a quick question answered

by andrew.c
Tags: answered, functions, insanely, trig
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andrew.c
#1
Apr7-09, 05:39 AM
P: 47
1. The problem statement, all variables and given/known data
I need to solve the equation [tex]cos 5x + cos 3x = cos x[/tex]

Do the first two terms add together to be cos 8x? Then use double angle formula to solve?
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rl.bhat
#2
Apr7-09, 05:45 AM
HW Helper
P: 4,433
Quote Quote by andrew.c View Post
1. The problem statement, all variables and given/known data
I need to solve the equation [tex]cos 5x + cos 3x = cos x[/tex]

Do the first two terms add together to be cos 8x? Then use double angle formula to solve?
No. cos 5x + cos 3x is not equal to cos8x.
Use formula to convert sum of trig. function to product form.


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