please prove: A,B,C are angles of triangle. Σ_(cylic) ((sinA+sinB)/(cosc))≥8cos(A/2)cos(B/2)cos(C/2)


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Question Number 107624 by mnjuly1970 last updated on 11/Aug/20

$p l e a s e p r o v e :$ $A, B, C a r e a n g l e s o f$ $t r i a n g l e .$ $\sum_{c y l i c} \frac{s i n A + s i n B}{c o s c} ⩾ 8 c o s \frac{A}{2} c o s \frac{B}{2} c o s \frac{C}{2}$
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