sin^3t+sin^2tcost+cos^3t+cos^2tsint=(sint+cost)(1-sintcost)+costsint(sint+cost)=
=(sint+cost)(1-sintcost+sintcost)=sint+cost
sin^3t+sin^2tcost+cos^3t+cos^2tsint=(sint+cost)(1-sintcost)+costsint(sint+cost)=
=(sint+cost)(1-sintcost+sintcost)=sint+cost