Here's some questions:
1) Solve 4cosx + 4sin2x = 5, -180 < x < 180o
2) Solve cosx = sin2x, 0 < x < 360o
3) 3cos2x = 1 - sinx, 0 < x < 360o
4) tan2x = 3tanx, 0 < x < 360o
5) By expressing cos3x as cos(2x + x), show that cos3x = 4cos3x - 3cosx. Hence solve cos3x + 2cosx = 0, where 0 <...