Question

Calculus 2,


can you please tell me how to move on, I am stuck ?
https://www.dropbox.com/s/90i176p69zf3hwl/Screenshot%202013-10-27%2013.28.24.jpg

Answer 1

whats the original Q ?

Answer 2

https://www.dropbox.com/s/2fxa32wrh8qnt4b/Screenshot%202013-10-27%2013.30.37.jpg

Answer 3

the cos phi gets cancelled....

Answer 4

phi ? where ??

Answer 5

you did not put dx =cos phi dphi

Answer 6

-_- I found it

Answer 7

oh wait I didn't actually

Answer 8

then there will be no denominator and this would simplify much...

Answer 9

-_- thanks

Answer 10

welcome ^_^

Answer 11

you first had put x = sin phi
now i am asking you to put cos x = u

Answer 12

3 int (1-c^2) s dphi
u = c , du = - s dphi

-3 int (1-u^2) du

Answer 13

I see