Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ ¹ ² ³ °
 

You are not logged in. #1 20131209 18:17:38
Need help on these 4 TRIG problemsActually just one question Last edited by steveyi (20131209 19:04:28) #2 20131209 19:43:12
Re: Need help on these 4 TRIG problemshi steveyi but, as you've got these decimal forms that means you'd have to use a calculator anyway so why not (i) use a calc. to get theta (ii) Your calc. will give a negative value so reverse the sign, then cos theta in the range 0 to pi/2 (ii) As you want a third quadrant value add another pi to your answer. (iii) As tan is positive in the third the value your calc. gives will be the one. http://www.mathsisfun.com/algebra/trig … rants.html Because trig functions are multivalued and a calculator will only give one answer, you'll always have to do a bit of this to get the values in the right quadrant. Bob You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei #3 20131210 02:55:43
Re: Need help on these 4 TRIG problemsHi; round to 4 digits .7259 tan(x) you can do. In mathematics, you don't understand things. You just get used to them. I have the result, but I do not yet know how to get it. All physicists, and a good many quite respectable mathematicians are contemptuous about proof. #5 20131210 04:20:49
Re: Need help on these 4 TRIG problemsTry the negative answer, i.e., 0.725900241... The limit operator is just an excuse for doing something you know you can't. “It's the subject that nobody knows anything about that we can all talk about!” ― Richard Feynman “Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment #6 20131210 04:26:26
Re: Need help on these 4 TRIG problemsHi; In mathematics, you don't understand things. You just get used to them. I have the result, but I do not yet know how to get it. All physicists, and a good many quite respectable mathematicians are contemptuous about proof. #7 20131210 06:17:09
Re: Need help on these 4 TRIG problems
What was I talking about ? Obviously you didn't want the angle, rather the cosine of the angle; so yes, please reverse the sign to get the third quadrant value. Sorry. Please pretend I said this in post 2. You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei 