a b c is atriangle such that tan (45 -(a/2 ) ) +tan (45 - (b/2) ) +tan (45 -( c/2) ) =1 find cos a+cos b +cos c
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I think the equality isn't true in a triangle. The equality is equivalent to (1) In a triangle we have the relation So (1) becomes , which is not true.
thank you
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