Question

Sabendo que sen x . Cos x = 1/4, determine o valor de sen (2x).

Answer 1

Multiplica e divide senx.cosx por 2:
2senxcosx/2=1/4
sen2x=2senxcosx, logo:
sen2x/2=1/4
sen2x=1/2.

Answer 2

Sex=1/2 ..............