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Mathematics 9 Online
OpenStudy (anonymous):

How I find x ? : (cos(2,5x))^2=-1

OpenStudy (anonymous):

DO you mean (cos(2.5x))^2=-1 ?

OpenStudy (anonymous):

Yes (in the netherlands the . is a ,)

OpenStudy (anonymous):

Well i can tell you for sure that there are no real solutions.

OpenStudy (anonymous):

O sorry it is by the way for\[[0,2\Pi]\]

OpenStudy (anonymous):

Ahhh got it now sorry haha :P.

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