Diketahui m=cos 2p+cos 2q dan p-q=150 derajat tentukan nilai m

[tex]m = \cos(2p) + \cos(2q) \\ m = 2 \cos(p + q) \cos(p - q) \\ m = 2 \cos(p + q) \cos(p - q) \\ m = 2 \cos(p+q) \cos(150) \\ m = 2 \cos(p+q) \cos(150) \\ m = 2\cos(p+q) ( - \frac{ \sqrt{3} }{2} ) \\ m= \cos(p+q)(-\sqrt{3})[/tex]