sinA+sinB+sinC=4cos1/2Acos1/2Bcos1/2C

..guys can you help me in proving this one..tnx..

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- September 26th 2013, 07:00 PMfireboy25half angle conversion formulas
sinA+sinB+sinC=4cos1/2Acos1/2Bcos1/2C

..guys can you help me in proving this one..tnx.. - September 26th 2013, 07:26 PMProve ItRe: half angle conversion formulas
Yikes this is hard to read, some brackets or spaces would be nice ><

Is it ? - September 26th 2013, 07:40 PMtopsquarkRe: half angle conversion formulas
- September 26th 2013, 09:21 PMibduttRe: half angle conversion formulas
Also must write the condition for this question we should have A + B + C = 180 degree.

Then use the sum and product formula: sin P + sin Q = 2 sin ( P+Q)/2 cos ( P-Q)/2 etc. - September 27th 2013, 01:05 PMtopsquarkRe: half angle conversion formulas
- September 27th 2013, 08:32 PMibduttRe: half angle conversion formulas
- September 29th 2013, 02:15 PMfireboy25Re: half angle conversion formulas
yes..the sum of A, B, C is 180..