If D=`|{:(1,sina,1),(-sina,1,sina),(-1,-sina,1):}|`, show that, `2 le D le 4`.

If (1+sinA)( 1+sinB)(1+sinC) = (1-sinA)(1-sinB)(1-sinC), then prove that the value of each side = +-cos A cosB cosC ,

Solve 1 le |x-2| le 3

If |(cos(A+B),-sin(A+B),cos2B),(sinA,cosA, sinB),(-cosA, sinA, cosB)|=0 then the value of B is -

If (sinA)/3=(sin B)/3=(sin C)/4 then prove that cosC=1/9

If 2sinA-1 = 0 then show that sin3A = 3 sinA -4sin^3A .

If sinA/3=sinB/3=sinC/4 then show that cos C=1/9

If in a triangle ABC, sinA, sinB,sinC are in A.P., then

In a DeltaABC,sinA/sinC=sin(A-B)/sin(B-C) then

In triangle A B C ,(sinA+sinB+sinC)/(sinA+sinB-sinC) is equal to

If tan A =ntanB , sinA =msinB , prove that , cos^2A=(m^2-1)/(n^2-1) .