Good morning everybody. I have a problem with this wikipedia passage https://en.wikipedia.org/wiki/Schwarzschild_geodesics#Bending_of_light_by_gravity 'cause it says "Expanding in powers of rs/r, the leading order term in this formula gives the approximate angular deflection δφ for a massless particle coming in from infinity and going back out to infinity:". I tried to use Taylor formula and integrate but i can't reach that formula even considering orders. Can someone help me please? I'm just going crazy on a stupid expansion in powers xD Thank you in advance.