>> syms a b x y
p=int(int(exp(-1/(2*pi*sqrt(1-0.7^2)))*(x^2-1.4*x*y+y^2)/(2*pi*sqrt(1-0.7^2)),-2.5,0.8*(b-0.5)),-2.5,0.7*(a+0.5))
p =
(1801948026337817*(14*a + 57)*(8*b + 21)*(1960*a^2 - 2352*a*b + 3486*a + 2560*b^2 - 3336*b + 25443))/24249678044451340800000
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