Well for the first derivative I got sinx*ln(secx+tanx)-(cosx*(secxtanx+sec^2x)/(secx+tanx))....have I missed out some simplification coz this looks ugly....
Well for the first derivative I got sinx*ln(secx+tanx)-(cosx*(secxtanx+sec^2x)/(secx+tanx))....have I missed out some simplification coz this looks ugly....
, so:
Now I leave the 2nd derivative to you...since you alread saw the 1st one is not that horrendous.