Question

cos alpha=3/4 then find 16 sin alpha/2 sin 3alpha /2​

Answer 1

Answer:

29 If cosα+2cosβ+3cosγ=sinα+2sinβ+3sinγ=0, then the value of sin3α+8sin3β+27sin3γ is 1) sin(a+b+γ) (3) 18 sin(α+β+γ) 2) 3 sin(α+β+γ) 4) sin(α+2β+3)