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anonymous
 5 years ago
can someone verify that Example 1 on this site has an error?
http://tutorial.math.lamar.edu/Classes/CalcI/TrigEquations_CalcII.aspx
I think the second angle is suppose to be 1.5344 and not 2.5345
anonymous
 5 years ago
can someone verify that Example 1 on this site has an error? http://tutorial.math.lamar.edu/Classes/CalcI/TrigEquations_CalcII.aspx I think the second angle is suppose to be 1.5344 and not 2.5345

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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0How do you figure? 2x  1 = 2.2143 + 2πn 2x  1 = 4.0689 + 2πn 2x = 2.2143 + 2πn + 1 = 3.2143 + 2πn 2x = 4.0689 + 2πn + 1 = 5.0689 + 2πn x = (3.2143 + 2πn) / 2 = 1.60715 + πn (mult. both 3.2143 and 2πn by 1/2) x = (5.0689 + 2πn) / 2 = 2.53445 + πn (mult. both 5.0689 and 2πn by 1/2)

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0well i got 2x1 = 2.2143 so i added one first to both side, getting 2x = 3.2143 + 2πn for my first angle. and the second angle would be 2π  3.2143 = 3.0689 so x = 1.5344 + πn

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Well, if you take the x that you calculated (i.e. 1.5344 + πn) where n = 0, you'll notice that when you put it back into cos(2x  1) it doesn't equal 3/5. So, your answer is incorrect. And it is probably because you either didn't have your calculator in radians or you took the x you calculated, which by the way is NOT the angle (2x  1 is) and subtracted 2π from it which will give you an incorrect answer. I checked both the answers for x in the example and they both equate to ≈ 3/5 = 0.6

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0you're right, I found my mistake. I changed the angle when I added 1 before calculating for the second angle. Thankss!
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