In `A B C` , prove that `cosA+cosB+cosClt=3/2dot`

Prove that cosA+cosB+cosC=1+r/R

Prove that cosA+cosB+cosC=1+r/R

In a triangle ABC, prove that: cos^4A+cos^4B+cos^4C= 3/2 + 2 cosA cosB cosC+ 1/2 cos 2A cos2B cos2C

If A+B+C=pi , prove that : cosA + cosB-cosC=4cos(A/2) cos(B/2) sin(C/2) -1

Prove that (b+c)cosA+(c+a)cosB+(a+b)cosC=2sdot

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

if A+B+C=pi , prove that cosA+cosB + cosC greater than or equal to 1

In DeltaABC , Prove that: cosA+cosB+cosC=1+4sinA/2sinB/2sinC/2

In any Delta A B C , prove that: (cosA)/(bcosC+c cosB)+(cosB)/(c cosA+acosC)+(cosC)/(acosB+bcosA)=(a^2+b^2+c^2)/(2a b c)

For any triangle ABC, prove that (cosA)/a+(cosB)/b+(cosC)/c=(a^2+b^2+c^2)/(2a b c)