Im struggling to finish this one
I = 1/( 2 + cos x) dx
using substitution t = tan1/2 x
I sub in for cos and recalcualte to give me
I = 2/(t^2 + 3) dt
I can see this is clse tot the form I = a/(t^2 + a^2) dt but can complete.
Can someone show me where I'm missing the link?