sin(π - α) = sin(π)cos(α) - cos(π)sin(α)
sin(π) = 0cos(π) = -1
Поэтому:
sin(π - α) = 0cos(α) - (-1)sin(α)sin(π - α) = -sin(α)
sin(π - α) = sin(π)cos(α) - cos(π)sin(α)
sin(π) = 0
cos(π) = -1
Поэтому:
sin(π - α) = 0cos(α) - (-1)sin(α)
sin(π - α) = -sin(α)