anonymous
  • anonymous
ACT Question: If the value, to the nearest thousandth, of cos theta is -0.385, which of the following could be true about theta? a.) theta is greater than or equal to 0 and less than pi/6 b.) theta is greater than or equal to pi/6 and less than pi/3 c.) theta is greater than or equal to pi/3 and less than pi/2 d.) theta is greater than or equal to pi/2 and less than 2pi/3 e.) theta is greater than or equal to 2pi/3 and less than or equal to pi
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
If the cosine of an angle is negative, then the angle is in either the second or third quadrant.
anonymous
  • anonymous
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pooja195
  • pooja195
Mass tag much? There is already someone helping.

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anonymous
  • anonymous
Please explain it cause I know the answer from the back of the act book but I just dont get it
pooja195
  • pooja195
Im not helping. @SithsAndGiggles is already helping you why not try to understand them rather than bring attention to the post.
anonymous
  • anonymous
In terms of \(x,y,z\), you have \(\cos\theta=\dfrac{x}{z}\) (where \(\theta\) is the angle I mistakenly left out). \(z\) is always taken to be a positive number, so if the trig ratio is negative, either \(x\) or \(y\) must be negative.
anonymous
  • anonymous
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