Search results

Sorry to ask so many questions ad taking up all your time but the textbook I'm using it pretty crap at explaining. In fact, there's baely any explanation. Anyways, when doing the exponential version, when taking as x approaches infinity and zero for logs, do I do as y approaches infinity and zero?

Trebla, when you said - As cos x --> ∞, ln cos x --> ∞ is useless because cos x never approaches infinity - As cos x --> 0, ln cos x --> - ∞ I'm not sure how you got to that conclusion. Could you please explain it for me.

OH RIGHT. I get it now. So basically, there are no general guides as to how to do these graphs. Rather, you just need to follow the features of both graphs. Right?

so the composite function will only be defined for -(pi/2) ≤ x < (pi/2); (3pi/2) < x < (5pi/2) etc etc (including negative domains) I'm not sure how you got to that conclusion.

Thanks for the general tips on solving graphs. It has REALLY helped me in this section. Now I'm up to graphs of composite functions and I'm not really sure what to do. eg. Graph y=ln(cosx)

Thanks. That really helps me. But I'm not sure how to find the limit a y approaches infinity. I know how to do the x one (please check for me) y=\frac{1}{4-x^2} lim x \to infinity \frac{\frac{1}{x^2}}{\frac{4}{x^2}-1} which \to 0 \therefore as \ x\to infinity\ ,y\to 0

Can somebody give me some tips on multiplying and dividing fuctions Eg. lnx / x

Thank you very much.

Hi. I'm not really sure about the theory behind graphing functions that look like f(x) = f abs(x) eg. f(x) = ln abs(x) Can someone please clarify.

I'll type up the questions I'm pretty sure is wrong. 3) Two minor planets of the Solar System have periods of 3.0 years and 4.0 years. What is the ratio of the average radii of their orbits. 4) On a distant solar system, two planets were observed to have radii of 4AU and 6AU. What would be...

Nah there's 10 questions in the set. But if you still want me to type it up, I'll do that.

Hi. If anyone has the answers to "28. Kepler's Law of Motion" in the Surfing Physics Space book, could they please post it up here so I can check my answers. Thanks in advance.

Anyone?

Got another one here. How do you change mod (1+i/z - 2) = 2 to mod (z - 1+i/2) = mod (z)

Yes I do. Thanks very much.

How does mod (2 - iz) change to mod (z + 2i)

Thanks freak. Can someone help me out here. I don't know how to finish this off. \frac{1-cos\Theta +isin\Theta }{1+cos\Theta +isin\Theta } \frac{2sin^2\frac{\Theta }{2}+i2sin\frac{\Theta }{2}cos\frac{\Theta }{2}}{2cos^2\frac{\Theta }{2}+i2sin\frac{\Theta }{2}cos\frac{\Theta }{2}}...

mod (z1 - z2) = mod (z1 + z2) Prove z2/z1 is purely imagenary.

Oops, forgot to state that the 90 degrees is not given. I'm doing this backwards.

Thanks for the help. I've been able to finish all my homework now, except this. How would you prove algebraically that z2/z1 is purely imagenary?