Fr. e.e points cause quitting

If theta is in quadrant iv and sin theta = - 1/2, then cos theta =

In nineteenth-century opera, the orchestra: a. became less important as vocal lines became more important. b. was reduced to a small group as opera houses became smaller. c. became more important than the vocal lines; the voices now accompanied the orchestra. d. increased in importance, sometimes providing special effects and overshadowing the voices.

Which one of the following is a characteristic of romantic music, but not one of the three key characteristics? experimental emotion extremes expression