SOLUTION: Would be sincerely grateful for help to solve this equation in radians and degrees {{{cos3x= 1/sqrt(2)}}}

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Question 667153: Would be sincerely grateful for help to solve this equation in radians and degrees
cos3x=+1%2Fsqrt%282%29

Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
Cos 3x= 1%2Fsqrt%282%29

3x = cos inverse (1/sq rt 2)
Thus, 3x = 45 degrees or 0.7854 radians
Therefore, x = 15 degrees or 0.262 radians