Integration by substitution (2 Viewers)

[sinophile]

Find

 

[H4rdc0r3]

fail. why would you need to use u, + you forgot dt.

+ C

 

[sinophile]

thats not what the textbook solution says.

 

[AlexJB]

 

[wantingtoknow]

thats not what the textbook solution says.

Is it because you did a typo? Is it dt instead of t as the numerator?

 

[Timothy.Siu]

Is it because you did a typo? Is it dt instead of t as the numerator?

then thats 4unit integration

 

[sinophile]

I didnt include the dt, sorry.

 

[thenuker6]

then thats 4unit integration

It's actually 3 unit as they give u the substitution

 

[Drongoski]

I find the practice of NSW HSC in providing the suggested substitution for integration makes this part of 3U really wimpish.

 

[jet]

They didn't give the substitution for one question last year in the 3u paper. That really really surprised me.

 

[Timothy.Siu]

It's actually 3 unit as they give u the substitution

ur an idiot, learn to read

 

[addikaye03]

They didn't give the substitution for one question last year in the 3u paper. That really really surprised me.

yer same, it was Q1 aswell i believe. Usually very very straight forward, no tricks.

Alot of poorer MX1 students would have seen the Sin^2x and straight away gone:
Cos2x=1-2sin^2x
...
sin^2x=1/2(1-cos2x) etc etc

When do the BOS notes for 2008 come out?

 

[sinophile]

isnt anyone going to answer my question ;_;

 

[kwabon]

thats how u do it mate

 

[Njn]

Yeah, that's how. Maybe you don't know the formula you need to use ? if you don't know logarithms and exponentials just follow it =)

http://img24.imageshack.us/my.php?image=submathsworking.jpg

Edit: I just noticed equation editor xD

 

[Timothy.Siu]

S f'(x)/f(x) dx = ln(f(x)

 

[sinophile]

But the textbook's solution says -sqrt(1-t^2)+c. This is from the fitzpatrick 3-u book btw.

 

[Timothy.Siu]

But the textbook's solution says -sqrt(1-t^2)+c. This is from the fitzpatrick 3-u book btw.

then the original question was supposed to have a square root

 

[sinophile]

then the original question was supposed to have a square root

.. FUCK

edited my original post

 

[Njn]

then the original question was supposed to have a square root

FUCK

Lol.