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OpenStudy (anonymous):
Find the intersection points for F(t)=80-10cos(pi*t/12) greater than or equal to 78. The answer is 5.2308694 less than or equal to t less than or equal to 18.766913. I got the 5.2308694 part but not the 18.766913. I know that I need to graph this function and find the intersection points but can someone tell me what should I do?
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