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