Double Integrals: Find ∫∫R y/x dA,where R is the region in the first quadrant x^2+y^2=1 ; x^2+y^2=4

Here is the technique to find this double integrals by polar coordinates:

Full question: Find ∫∫R y/x dA , where R is the region in the first quadrant lying between the circles x^2+y^2=1 and x^2+y^2=4 and between the lines y=0 and y=x

#Calculus
#DoubleIntegrals
#Intgerations