`a.cosA+b.cosB+c.cosC=2asinBsinC`

For any triangle ABC, prove that : acosA+bcosB+c cosC=2asinBsinC

For any triangle ABC, prove that acosA+bcosB+c cosC = 2asinBsinC

In any DeltaABC , prove that acosA+bcosB+c cosC=2asinBsinC .

If A+B+C=pi , prove that : sinA cosB cosC +sinB cosC cosA + sinC cosA cosB = sinA sinB sinC .

If A+B+C=pi , prove that : sinA cosB cosC +sinB cosC cosA + sinC cosA cosB = sinA sinB sinC .

(a+b+c)(cosA+cosB+cosC)

If A+B+C = pi , prove that : cosA- cosB - cosC = 1-4sinA//2cosB//2cosC//2 .

If A+B+C= pi ,prove that :cosA+cosB-cosC=-1+4cosA/2cosB/2sinC/2.

If A+B+C=pi , prove that : cosA sinB sinC +cosB sinC sinA+cosC sinA sinB=1+cosA cosB cosC .