Question

3sin13пи/12 *cos13п/12

Answer 1

3sin(13π/12) * cos(13π/12) = 1.5 * (2 * sin(13π/12) * cos(13π/12)) = 1.5 * sin(13π/6) = 1.5 * sin(π/6) = 1.5 * 0.5 = 0.75

Answer 2

Получаеться:
3/2*2sin(13п/12)*cos(13п/12)
3/2*sin(2*13п/12)
3/2*sin(13п/6)
3/2*1/2
3/4