Question

plz solve it fast from differntiatation

Answer 1

Put x=coso in sec-1[1/2x2-1] then u get 2o put again o=cos-1x then diff with respect to x......1
similarly put x=coso in [1-x2]½ u get sino put again o=cos-1x then diff with respecttox...........2
der of 1w.r.t 2 is 2d(cos-1x)/d(sin[cos-1x])=2/(1/2)=4