I'm using a website suggested by a member here on Y!Answers for trig, but I swear this guy's math is wrong!

Question

Take a look at Example #5 on this website please:

http://tutorial.math.lamar.edu/Classes/CalcI/TrigEquations_CalcI.aspx

(It's about 3/4 of the way down on the page.) I follow everything that he's doing up until the point where he actually plugs in his answers and gets the solutions. I think that HE did something wrong because there's no way possible (or at least not that I can figure out) that you can come up with those answers by plugging in the provided values. Can someone please help with this? Either confirm that he's wrong, or please explain what I'M doing wrong that I keep getting different answers. For example, for the #5, I got things like:

For n = -1
-.2535
-2.0043

For n = -2
-3.3951
-4.9659

For n = -3
-6.5367
-8.1075



WHAT IS UP WITH THIS?! THANK YOU!

Christina - did you actually think that you would be picked for best answer with that rude, completely unhelpful "answer"? If so, you were sadly mistaken.

Answer 1

There is a mistake on the website, and I can tell you exactly what it is. He wrote the formulas x = 2.8881 + pi*n and 1.3173 + pi*n, but evaluated and posted the results for 2.8881 + 2*pi*n and 1.3173 + 2*pi*n instead. Notice that your results for n = -2 match his results for n = -1, because he doubled what he was supposed to be adding.

Answer 2

truthfully a cucumber is reliable. you in simple terms could scrape out the interior. additionally there's a melon, bathroom paper roll, filled animal, between your matress, between your settee coushin, and thats approximately it. I havent tried all of those yet Ive heard of maximum and tried some. they in many cases dont paintings till your inventive and keen to place forth the attempt to establish all those products.

Answer 3

consider going to your school for a math tutor.