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Prove that sinA+sinB+sinC=-4cosA/2cosB/2cosC/2

Prove that sinA+sinB+sinC=-4cosA/2cosB/2cosC/2
1. 1 answer
2. asked by jacent
3. 1,453 views
a+b+c=180,show that sina+sinb+sinc=4cosa/2cosb/2cosc/2
1. 1 answer
2. asked by Khat Si Thu Aung
3. 665 views
If sin a + sinb + sinc = 4cosa/2cosb/2cosc/2Then sin 2a + sin2b + sin 2c = 4cosacosbcosc
1. 1 answer
2. asked by Anonymous
3. 521 views
Prove That Sin2A+ Sin2B +SIN2C/sinA+SINB+SINC=8sinA/sinB/2COSC/2
1. 1 answer
2. asked by Joel
3. 1,001 views
If A + B + c = 180 then show thatsinA + sinB + sinC=4cosA/2. cosB/2 . cosC/2
1. 2 answers
2. asked by Robert
3. 1,463 views
If A+B+C=^(^=180) prove thatsinA + sinB - sinC = 4sinA/2 sinB/2 cosC/2
1. 2 answers
2. asked by ody
3. 2,067 views
if cos(B-C)+cos(C-A)+cos(A-B)=-3/2 then prove that cosA+cosB+cosC=O and sinA+sinB+sinC=O after that prove that
1. 1 answer
2. asked by Binoy kumar mahato
3. 2,321 views
Prove the law of sines for triangle ABC i.e sinA/a=sinB/b=sinC/c.0 please help me!!!
1. 1 answer
2. asked by Meron
3. 699 views
If A + B + C = π, prove that: ( sin2A + sin2B + sin2C ) / ( sinA + sinB + sinC ) = 8 sin(A/2) sin(B/2) sin(C/2)
1. 2 answers
2. asked by manish
3. 924 views
Prove: 1+(TanA/SinB)^2/1+(TanA/SinC)^2 = 1+(SinA/TanB)^2/1+(SinA/TanC)^2
1. 4 answers
2. asked by Rabin
3. 3,761 views