Question

answer the question​

Answer 1

$2sina - 1 = 0 \\ 2sina = 1 \\ sina = \frac{1}{2}$

Therefore,

$3sina - 4 {sin}^{3} a \\ = 3( \frac{1}{2} ) - 4( { \frac{1}{2}) }^{3} \\ = \frac{3}{2} - \frac{4}{8} \\ = \frac{3}{2} - \frac{1}{2} \\ = \frac{3 - 1}{2} \\ = \frac{2}{2} = 1$

Answer 2

Answer:

answer= 1..............