Computethefollowingforthefunctionf$($x$1,$x$2)=$ex$1+$x$1$x$2$log$(1+$x$2).($A$)$Theexpressionforgradient$,$ itsdimensionanditsvalueat$(1,2).(2$marks$)($B$)$TheexpressionfortheHessianmatrix$,$ itsdimensionanditsvalue at$(1,2).(2$marks$)($C$)$Thederivative df dt usingchainruleofdifferentiationwhenx$1=$t$2+2$at$,$ x$2=$sin$($t$).$