Berechne das Integral zur Funktion f ( x , y ) = x ( sin x ) ( cos ( x y ) ) {\displaystyle {}f(x,y)=x(\sin x)(\cos \left(xy\right))} über dem Rechteck Q = [ 0 , 3 π ] × [ 0 , 1 ] {\displaystyle {}Q=[0,3\pi ]\times [0,1]} .
![{\displaystyle {}Q=[0,3\pi ]\times [0,1]}](https://wikimedia.org/api/rest_v1/media/math/render/svg/caf953ab0dd4a41f52070c193c1df878a7a1a36b)