(1+(y*tan(0))^2 -y^2 )/((1+(y*tan(0))^2 -y^2 )^2 +4*(y*tan(0))^2 *y^2 )(1+(y*tan(0))^2 -y^2 )/((1+(y*tan(0))^2 -y^2 )^2 +4*(y*tan(0))^2 *y^2 )

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