Question: x = 1 , y = 5 x = 2 0 , y = 3 0 d x d y = x = 1 ,

x=1,y=5x=20,y=30dxdy=
x=1,y=1x=4,y=6(1x)ydxdy=
Use identity cos()2=12(cos(2)1)
x = 1 , y = 5 x = 2 0 , y = 3 0 d x d y = x = 1 ,

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