In △ABC ,Find the value of `1/2a^2 (SinBSinC )/SinA` =

In any DeltaABC , find the value of (a^(2)sin(B-C))/(sinB+sinC)+(b^(2)sin(C-A))/(sinC+sinA)+(c^(2)sin(A-B))/(sinA+sinB)

In triangle ABC , if AB=2,BC=4 and AC=5, then the value of (sinA-sinB)/(sinC) is equal to

If sinA=3/5 , where 0^(@)ltA lt 90^(@) , find the values of sin 2A, cos 2A, tan 2A and sin 4A .

If sinA=cosA,then find the value of sin 2A.

If sinA=(3)/(4) , then find the value of tan A.

Prove by vector method that the area of /_\ABCis (a^2sinBsinC)/(2sinA) where symbols have their usual meanings.

If sec A= 2, then find the value of (1)/(cotA)+(cosA)/(1+sinA)

If sinA+cosecA=3 , then find the value of (sin^(4)A+1)/(sin^(2)A) .