If A,B and C are the angles of a triangle and `|{:(1,1,1),(1+sinA,1+sinB,1+sinC),(sinA+sin^(2)A,sinB+sin^(2)B,sinC+sin^(2)C):}|` =0 then prove that `Delta` ABC must be isoceles.

If A, B and C are interior angles of a triangle ABC, then show that sin((B+C)/2)=cos(A/2)

If A,B and C are the angle of a non-right angled Delta ABC the value of |{:(tanA,1,1),(1,tanB,1),(1,1,tanC):}| is

If A , B and C are interior angles of triangle ABC ,then show that sin ((B+C)/( 2) )=cos (A) /(2)

If A,B and C are the angle of a triangle show that (i) |{:(sin2A,sinC,sinB),(sinC,sin2B,sinA),(sinB,sinA,sin2C):}|=0. (ii) |{:(-1+CcosB,cosC+cosB,cosB),(cosC+cosA,-1+cosA,cosB),(-1+cosB,-1+cosA,-1):}|=0.

If A,B,C are the angles of a triangle then prove that cosA+cosB-cosC=-1+4cos(A/2)cos(B/2)sin(C/2)

If any triangle ABC, a=18,b=24,c=30 sinA,sinB,sinC

In DeltaABC , if cosA=(sinB)/(2sinC) then show that DeltaABC is an isoscles triangle.

(sin(A-C)+2sinA+sin(A+C))/(sin(B-C)+2sinB+sin(B+C)) is equal to

The determinant |{:(sinA,cosA,sinA+cosB),(sinB,cosA,sin+cosB),(sinC,cosA,sinC+cosB):}| is equal to zero

Prove that, sinA+sinB+sinC-sin(A+B+C)= 4sin((A+B)/(2))sin((B+C)/(2))sin((C+A)/(2))