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Mathematics 7 Online
OpenStudy (anonymous):

cosA= 1/7 and cosB= 13/14. Show that A-B=60 degrees.

OpenStudy (amistre64):

well, what do we know of the cos(A-B) ?

OpenStudy (anonymous):

@amistre64 I got the answer. Anyway, if you are interested I can tell it to you.

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