SOLUTION: Solve it for 0<x<2pi cos(x+45)+cos(x-45)=radical 2 *both 45's are in degrees

Question 817705: Solve it for 0 cos(x+45)+cos(x-45)=radical 2
*both 45's are in degrees
Answer by lwsshak3(11628) (Show Source): You can put this solution on YOUR website!
cos(x+45)+cos(x-45)=radical 2
Identity:

2cos(x)cos(45)=√2
2cos(x)(√2/2)=√2
cos(x)=√2/√2=1
x=0
..
Check:
cos(x+45)+cos(x-45)
=cos(45)+cos(-45)=cos(x+45)+cos(x-45)=√2/2+√2/2=2√2/2=√2
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