integration (1 Viewer)

[KeypadSDM]

Originally posted by Grey Council
uh, thats like impossible to see. Literally.
all right, Keypad, answer honestly, would you have seen it if someone had given it to you last year? Honestly, now... Cause if you wouldn't have seen it, then I can forget about it. mmm

I might have:

Consider, the function given to integrate is kinda like x^-2, thus the substitution is kinda like x^-1.

Ok, I'm not even convincing myself here.

 

[Grey Council]

Originally posted by CM_Tutor
No, it isn't. As I said above, my class solved it - we spent some while discussing it, but both the u = 1 + 1 / x and
x = tan²@ substitutions were suggested after we had discussed the more obvious alternatives, like u = 1 + x, etc. I'm not saying it's easy - it isn't - but it is possible.

fair enough.
Hrm, the thing that always worries me is that if I don't KNOW that there is such a substitution, I will never look for one in an exam. If I see a way to do, I just do it that way. hehe

hehe, Keypad, thats reassuring. ^__^ ta