`sin3A+sin2A-sinA` is

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Prove that : sin3A+ sin 2A- sinA= 4 sinA cos frac (A)(2) cos frac (3A)(2) .

Prove that sin3A=3sinA-4sin^3 A

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

Prove that sinA+sin2A+sin4A+sin5A=4 cos(A/2)cos((3A)/2)sin3A

Prove that, sinA+sin2A+sin4A+sin5A= 4cos((A)/(2))cos((3A)/(2))sin3A .

Prove that: sinA+sin2A+sin4A+sin5A= 4sin3A. cosA/2.cos(3A)/(2)

Prove that (sin3A+sinA)sinA+(cos3A-cosA)cosA=0

The equality sinA+sin2A+sin3A=3 holds for some real value of A.

If A=30, then show that sin3A=3sinA-4sin^(3)A