[14:19] User 1 : Did you finish the math homework?

[14:19] User 2 : No, I'm still working on it

[14:19] User 2 : Actually i would like some help

[14:19] User 1 : Sure, what problem are you stuck on?

[14:19] User 2 : I'm stuck on problem 4b

[14:19] User 2 : I don't understand the chain rule

[14:21] User 2 : Like how do you take the derivative of cos(2x)

[14:22] User 1 : First, the derivative of cos is -sin, so you would first write down -sin(2x). However, there is a 2x within the cosine term, which is treated as its own function that you also need to take the derivative of. The derivative of 2x is 2. The chain rule says that you multiply -sin(2x) by 2, so the answer would be -2sin(2x)

[14:22] User 2 : Oh, okay, thanks, this is very helpful

[14:22] User 2 : I think I'm able to work out the rest of the problems now.

[14:37] User 1 : Are you free this weekend?

[14:38] User 2 : Yeah

[14:38] User 2 : Why?

[14:38] User 1 : I was thinking that we could go up to San Francisco

[14:38] User 2 : Ok, what day and what time, and what are we going to do there?

[14:40] User 1 : I mainly want to visit the Golden Gate Bridge, Fisherman's Wharf, and the Ferry Building. If we have time, we could go to Alcatraz or the Twin Peaks.

[14:41] User 1 : I think it would be fun to visit the city

[14:41] User 2 : Okay, that sounds fun

[14:41] User 2 : Let's make a thread

[14:41] User 1 (in thread): What day are you available?

[14:42] User 2 (in thread): Either day works for me

[14:42] User 2 (in thread): How are we getting there

[14:42] User 1 (in thread): Ok, sounds good

[14:42] User 1 (in thread): I think we can take public transit, driving to SF can be a pain sometimes

[14:43] User 1 (in thread): Caltrain probably works, or we can also take BART

[14:43] User 1 (in thread): It's like 50 minutes from the Millbrae Station to Montgomery St

[14:44] User 2 (in thread): Caltrain works better for me

[14:44] User 2 (in thread): What are we doing after we get there

[14:44] User 1 (in thread): We can rent a scooter or something

[14:44] User 2 (in thread): The GG bridge is on the opposite side of the city from 4th & King

[14:45] User 1 (in thread): We can probably take T third to Chinatown and do something there

[14:46] User 1 (in thread): After that we can rent a BayWheels bike and bike to Fisherman's Wharf

[14:48] User 1 (in thread): Then take the 30 Stockton or 28 19th Av to GG bridge

[14:48] User 2 (in thread): Ok that sounds good

[14:48] User 2 (in thread): After that we can just do whatever

[14:49] User 2 (in thread): We don't really need to plan this out too much

[14:49] User 1 (in thread): I agree

[14:50] User 1 (in thread): There's plenty of bus routes we can take back to the city center so we have quite a bit of flexibility

[14:51] User 1 : on an unrelated note did you finish the essay

[14:52] User 1 : I feel like I should finish it before going to the city

[14:52] User 2 : Yeah, I finished it yesterday

[14:52] User 2 : Did you not?

[14:52] User 2 : The deadline is approaching

[14:52] User 1 : No

[14:52] User 1 : I need to get on that

[14:53] User 2 : You're writing about the American Dream and the Great Gatsby right?

[14:53] User 2 : I feel like that should be pretty easy to finish

[14:53] User 1 : Yeah, I've just been procrastinating

[14:53] User 1 : I'll finish it right now

[14:54] User 1 : Not necessarily the American Dream, more like the contrast between old money and new money

[14:54] User 1 : But yeah it's a similar idea

[14:54] User 2 : Ok you should probably start working on that now

[15:33] User 2 (in thread): Actually how much will this trip cost

[15:33] User 2 (in thread): I'm worried that we might have to pay a lot of money

[15:34] User 2 : My essay is done btw

[15:34] User 2 (in thread): I don't want to worry about paying that much money

[15:34] User 1 (in thread): It should be fine because transit is cheap

[15:34] User 2 (in thread): Ok