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Grade 11Trigonometry

if cos theta is equal to – 0.5 and theta belongs [0, 2 pi] then theta is equal to
  1. 60,120
  2. 120,240
  3. 240,300
  4. 60,300

Profile image of Maithily
8 Years agoGrade 11
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1 Answer

Profile image of sonika p
8 Years ago
if cos theta = -0.5,
since cos theta is negative in both 2nd and 3rd quadrant and cos 60 is 0.5. 
theta belongs to either 2nd quadrant or 3rd quadrant and is a multiple of 60. 
thus theta is 120 or 240. 
 

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