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Answered 2013-11-05 02:35:59







Quadratic formula:





cosx=approximately -2.41 or approximately 0.41.

Since the range of the cosine function is [-1,1], only approx. 0.41 works.


cosx= approx. 0.41

Need calculator now (I went as far as I could without one!)

x=approx 1.148

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