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Mathematics 21 Online
OpenStudy (anonymous):

Without using a calculator, determine two angles between 0 degrees and 360 degrees that have a cosine ratio of -1/2

OpenStudy (anonymous):

Someone tell me how to do this please

OpenStudy (anonymous):

120 degrees and 240 degrees

OpenStudy (anonymous):

From special angles you have to know that the cos of 60 will give you 1/2 |dw:1354811584489:dw|

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