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OpenStudy (anonymous):
Confusion about inequalities in trigonometry. f(x)=-2cosx+1 a)Solve for f(x)=0 b)Solve for f(x)>0 c)Solve for f(x)<0 a) Is easy. f(x)=pi/3 and 5pi/3 b) and c) is where I get messed up. Our teacher has us graph the cos (x) graph and then the line y=1/2 and find the two intersections. I thought anything over the intersections was considered greater than 0 and anything below the intersections on the graph was less than 0. The book says the opposite but I think the book maybe wrong? Someone please explain?
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