SOLUTION: QUICK! Could someone help me with this question. Solve {{{cos2x=sqrt(2)/2}}} in an algebaic manner and state the general solutions. Best regards in advance...

Question 61461: QUICK!
Could someone help me with this question.

Solve in an algebaic manner and state the general solutions.

Best regards in advance...
Answer by 303795(602) (Show Source): You can put this solution on YOUR website!

Divide top and bottom on the Right Hand Side by to get

Cos (45) = cos (135) =
So x = 22.5 degrees or x = 67.5 degrees.
The Cos function is periodic so these values will repeat every 360 degrees
so x = 22.5 + 360n where n is any integer
or
so x = 67.5 + 360n where n is any integer
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