∫(0->∞) k e^[-(2x+3y) ] dx=k e^(-3y) [ -(1/2) e^(-2x) ] |(0->∞)=(1/2) k e^(-3y)∫(0->∞) [∫(0->∞) k e^[-(2x+3y) ] dx ] dy=∫(0->∞) (1/2) k e^(-3y) dy=-(1/6)k [ e^(-3y)] |((0->∞)=(1/6)k
