For what values of k (cosA−(1/5))(cosB−(1/5))(cosC−(1/5))≤k hold in all triangles ABC?


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Question Number 102705 by dw last updated on 10/Jul/20

$F o r w h a t v a l u e s o f k (c o s A - \frac{1}{5}) (c o s B - \frac{1}{5}) (c o s C - \frac{1}{5}) ⩽ k$ $h o l d i n a l l t r i a n g l e s A B C ?$
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