If the angle between the circles $x^2+y^2-4 x-6 y-3=0, x^2+y^2+8 x-4 y+\lambda=0$ is $60^{\circ}$, then a value of $\lambda$ is

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If the angle between the circles $x^2+y^2-4 x-6 y-3=0, x^2+y^2+8 x-4 y+\lambda=0$ is $60^{\circ}$, then a…