for a triangle ABC ... find minimum value of CosA.CosB.CosC


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Question Number 133347 by rs4089 last updated on 21/Feb/21

$f o r a t r i a n g l e A B C . . .$ $f i n d m i n i m u m v a l u e o f$ $C o s A . C o s B . C o s C$
Commented by mr W last updated on 21/Feb/21

$i t h i n k t h e r e i s n o m i n i m u m,$ $m i n i m u m \to - 1$
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