sin(-135°) = -sin(135°) = -\frac{\sqrt{2}}{2}
cos 60° = \frac{1}{2}
-8\sqrt{2} * (-\frac{\sqrt{2}}{2}) * \frac{1}{2} = -8 * (-\frac{2}{2}) * \frac{1}{2} = -8 * (-1) * \frac{1}{2} = 4