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OpenStudy (anonymous):
find the exact value of the remaining trigonometric functions of θ. cosθ=(4)/(5) , 270° < θ < 360°
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OpenStudy (rulnick):
theta = acos(4/5) = 36.9 degrees (rounded) so the theta you want is 360-36.9 = 323.1 degrees (rounded)
hero (hero):
not exactly an exact value, but okay
OpenStudy (rulnick):
oh, my mistake. thanks, Hero. I'll get the exact value.
hero (hero):
Yeah, if it hadn't said "find exact value", I would have already posted the solution
OpenStudy (rulnick):
Well, the best we can do is 360 - acos(4/5), or am I missing an obvious closed form for acos(4/5) ... ?
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