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valuate the given integral by changing to polar coordinates. \( \iint_{R}(4 x-y) d A \), where \( R \) is the region in the first quadrant enclosed by the circle \( x^{2}+y^{2}=4 \) and the lines \( x=0 \) and \( y=x \)

given that x2+y2=4,x=0,y=x let pol