 #1
lo2
 55
 0
Homework Statement
Solve this equation:
[itex]cos^2(2x)=0,36[/itex]
For [itex]x \in [\pi;\pi][/itex]
Homework Equations

The Attempt at a Solution
[itex]cos^2(2x)=0,36 \Leftrightarrow cos(2x)=\sqrt{0,36} \Leftrightarrow 2x=cos^{1}(\sqrt{0,36}) [/itex]
And then I am not sure exactly how to proceed... When should I put in the [itex] 2p \pi [/itex] where [itex] x \in Z [/itex], to get all of the possible solutions?
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