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2014-06-15T16:52:29+07:00
24). (2V61)^2 = 10^2+8^2 - 2.10.8.cosA
244 = 100+64-160.cosA
160.cosA = 164-244= -80
cosA = -80/160= -1/2

25). cos x=-1/2
cos x=cos 120°
x1=120+k.360
x1=120
x2=-120+k.360
x2=240
HP{120°,240°}
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