SOLUTION: cos (x) = 1 / sqrt 2

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Question 1198715: cos (x) = 1 / sqrt 2
Answer by ikleyn(52846) About Me  (Show Source):
You can put this solution on YOUR website!
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Given :    cos(x) = 1%2Fsqrt%282%29 = sqrt%282%29%2F2.


ANSWER :  x = pi%2F4  or  x = 7pi%2F4  (two solutions).

That's all.