I hate trigonometry, I hate trig substitution, and I hate integration.

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notfred

Lifer
Feb 12, 2001
38,241
4
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god damn stuff doesn't make any sense. What the hell an I suppsoed to do with integral(tan x)^2 dx? I Know I'm supposed to automatically recognize some stupid identity from some trig class I got a C in 8 years ago. How the fvck am I supposed to remember that? I hate this crap. I have to glance at a problem and be able to tell that it fits into some non-standard form of some stupid trig identity...

<- waits for the "calculus is easy, wait till you take math course X" posts...
 
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GiLtY

Golden Member
Sep 10, 2000
1,487
1
0
Well, only way to remember is do the problems again!:D

BTW, I think for that problem you need to apply the chain rule
 
S

Spoooon

Lifer
Mar 3, 2000
11,563
203
106
You'll start to have some of that stuff memorized as you do the homework. It sucks for a while having to look things up.
 
OS

OS

Lifer
Oct 11, 1999
15,581
1
76
Originally posted by: notfred
god damn stuff doesn't make any sense. What the hell an I suppsoed to do with integral(tan x)^2 dx? I Know I'm supposed to automatically recognize some stupid identity from some trig class I got a C in 8 years ago. How the fvck am I supposed to remember that? I hate this crap. I have to glance at a problem and be able to tell that it fits into some non-standard form of some stupid trig identity...

<- waits for the "calculus is easy, wait till you take math course X" posts...
Click to expand...

If you feel lazy, use a table of integrals. The answer to your problem is tan x - x + C



 
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notfred

Lifer
Feb 12, 2001
38,241
4
0
Originally posted by: Spoooon
You'll start to have some of that stuff memorized as you do the homework. It sucks for a while having to look things up.
Click to expand...

That'd be great if I wasn't being tested on it tomorrow....
 
OS

OS

Lifer
Oct 11, 1999
15,581
1
76
Originally posted by: notfred

That'd be great if I wasn't being tested on it tomorrow....
Click to expand...

Can you bring a TI-89? They do symbolic calculus.
 
N

notfred

Lifer
Feb 12, 2001
38,241
4
0
Originally posted by: OS
Originally posted by: notfred

That'd be great if I wasn't being tested on it tomorrow....
Click to expand...

Can you bring a TI-89? They do symbolic calculus.
Click to expand...

I can bring it, I just can't turn it on. I wonder why I ever bought this thing... no one ever lets me use it in class.
 
D

dighn

Lifer
Aug 12, 2001
22,820
4
81
Originally posted by: notfred
god damn stuff doesn't make any sense. What the hell an I suppsoed to do with integral(tan x)^2 dx? I Know I'm supposed to automatically recognize some stupid identity from some trig class I got a C in 8 years ago. How the fvck am I supposed to remember that? I hate this crap. I have to glance at a problem and be able to tell that it fits into some non-standard form of some stupid trig identity...

<- waits for the "calculus is easy, wait till you take math course X" posts...
Click to expand...

you have to practice a lot... and it becomes more natural with time.
 
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Woodchuck2000

Golden Member
Jan 20, 2002
1,632
1
0
Trig identities are sorta like the advanced equivalent of times tables - everythings much much easier if you know them.

You do that integral like this, btw:

(tan x)^2 = 1 + (sec x)^2
integral of 1 is x,
integral of (sec x)^2 is (tan x)
plus a constant of integration
 
BD231

BD231

Lifer
Feb 26, 2001
10,568
138
106
Originally posted by: saltedeggman
Calculus is bad, bad, bad
Click to expand...

Any form of math is bad, bad, bad :eek:.

<~~~ legally mathematically retarted, anything beyond the number 6 and you've lost me

Sucks even more when you do better than most in ANY OTHER SUBJECT. Working with the geeks is a pretty good way to get better though, that's what I always did. Just tell them you wont take their lunch money for a week and they are more than willing to help out :D.
 
O

Orsorum

Lifer
Dec 26, 2001
27,631
5
81
Calculus is easy, wait until you get into dynamics and various models... or even better, theoretical mathematics... "WTF is a quantum?!?!?" <--- me in my independent study session
 
zephyrprime

zephyrprime

Diamond Member
Feb 18, 2001
7,512
2
81
Buy those laminated math cards. Their great. Otherwiase, it's too hard to remember all the identities.
 
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brtspears2

Diamond Member
Nov 16, 2000
8,659
1
81
I feel for you, my head hurts again trying to remember all these identies.

<--- ran though all the math courses, got C's in each level ... *sigh*:(
 
R

Reel

Diamond Member
Jul 14, 2001
4,484
0
76
I still have them programmed in my calculator from when I took that class. :D
 
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Spac3d

Banned
Jul 3, 2001
6,651
1
0
Dude, if you think that is rough, just wait till you get to the higher math's:frown:
 
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brxndxn

Diamond Member
Apr 3, 2001
8,475
0
76
Keep your TI 89... I bought it two years ago and had 1 1/2 years of not being able to use it.. But now, all my professors expect that kind of calculator so you can do integration on the fly..

Like, in my circuits class, he expects to teach circuits; not mathematics. So, he wants us to have a TI 89 so we can integrate very quick so he can ask us a boatload more questions on the exam and expect them to be done in 50 minutes.
 
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