in AB^Δ C , prove that: sin(2A)+sin(2B)+sin(2C) ≤cos ((A/2)) + cos ((B/2))+cos((C/2))


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Question Number 176140 by mnjuly1970 last updated on 13/Sep/22

$i n A \overset{Δ}{B C}, p r o v e t h a t :$ $s i n (2 A) + s i n (2 B) + s i n (2 C)$ $⩽ c o s (\frac{A}{2}) + c o s (\frac{B}{2}) + c o s (\frac{C}{2})$
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