Question

cal help pl ...

Answer 1

\[\int\limits \frac{ dx }{(2+cosx) }\]

Answer 2

@terenzreignz @UnkleRhaukus @texaschic101

Answer 3

@whpalmer4

Answer 4

Substitute \[\tan (x/2) = t\]
Then \[\cos x = 1 -t ^{2}/1+t ^{2}\]
\[dx = 2 dt/1+t ^{2}\]
You will end up with a quadratic. Then integrate.

Answer 5

weres how did u assume that tanx/2 ....

Answer 6

You have the complete solution now.

Answer 7

yaa but i have not yet got clicked about tanx/2

Answer 8

2 + cosx = 1 + 2cos^2 (x/2)

1/(1+ 2cos^2 (x/2)) = sec^2 (x/2) / (sec^2 (x/2) + 2)
= sec^2 (x/2) / (tan^2 (x/2) + 3)

now tan(x/2) = t seems more logical

Answer 9

u=tan(x/2) was just a substitution to make things easy....in the end you'll see u has been replaced by tan(x/2)..you don't wanna do that, no problem just don't put u=tan(x/2)..it won't make any difference..it'll just make things look messy

Answer 10

thanks ,.... guys ...