Brushing up on Calculus

[JenniferG]

Again I wouldn't invest in a teaching text book.   You have already gone through that and will just need refreshing from time to time.    Spending months on getting to 100% mathematically is a big distraction when you can start engineering hardware tomorrow.   I'd spend the money on breadboards, power supplies and instrumentation.

Thanks a lot.  I got a few math text books recently, used, for a few dollars each.. I buy older editions.  Or I get free ones with PDF  (e.g. OpenStax, etc..)

I already have all the semiconductors, breadboards, test equipment I need; pretty much set there.   I have 13 photo storage boxes full of semiconductors, tools, and what not.  I have a bench multimeter, portable multi, SDS-1104X-E scope, bench power supply, function generator, Hakko 926, Tektronix 2225 analog scope etc..

Actually having a bit of fun working the algebra problems in the Blitzer Algebra & Trig book.  I forgot so much    Enjoying not having to rush through the math books this time; working every problem. I really want this to set in so I don't forget it in the future.  I tried reading Practical Electronics for Inventors and The Art of Electronics without refreshing the math and it was irritating me that I didn't understand the math.  I really have forgotten almost all of what I learned 30 years ago.  30 years is a long time.

[MarkKn]

Prof. Strang’s calc text is freely available in pdf form. Look on mit courseware or the web. Some of his lectures are on youtube.

[wizard69]

30 years is a long time.

You are taking to somebody that is 62 going on to real old age.    I've forgotten much from those years from college and high school, worse sometimes I forget where my keys are!    

I really believe that the math will come back to you and that you will need to use it in a way that applies to electrical engineering.   In any event if this is a hobby, the important thing is to have fun.

[JenniferG]

My favorite calculator is the HP48GX.  I bought one back in late 1992 and also recently re-acquired one for a good deal (under $100). 

I just got an iPhone 11 (used for $250 in mint cond with 97% battery health).  It makes use the HP48GX app on my phone a great experience.  The app runs the HP48GX like at least 10 times faster.  Calculations are instant.  I really like that it is backlit unlike the HP48GX.  My eyes at 52 aren't as good as they used to be and need more lighting.

I'll probably sell my HP48GX  for $250 which will be like getting this phone for free essentially.  My HP48GX is in mint cond with black LCD display -- a more rare LCD screen compared to the blue text.

Here's a photo of my iPhone 11 running the app side by side with my HP48GX.  Just snapped it.  Imagine if I had the iPhone 11 Pro Max or whatever.. it'd be huge, closer to the side of the HP48gx.  But I am really happy with the size of the iphone 11 because I can easily press any button on the screen.



The name of the iPhone app I am using is called "iHP48".

[JenniferG]

Made a quick little youtube video using the app so you can see how snappy it is.   (Sorry for the iphone rocking around on the table each keypress, I have to buy a case for it now.. just got the phone today.)

I calculated a loan payment on a 30 year loan at 4.65% for 76,000  (future value of 0).   And it results in 391 payment which is correct.

I like how the top row of buttons are assignable to built in apps and apps you can write in basic.   With TVM SOLVR enabled the calculator becomes a great financial calculator as well as scientific.

[dmowziz]

Here's a simple calculus problem that you can help me solve

Asked on a math forum a day ago, no response yet.


Please how is the integral derived?
The problem is the 2nd coefficient in the sine term.


Thanksss