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At point $$(x_1,y_1)$$ on circle $$x^2 + y^2 = r^2$$: $$xx_1 + yy_1 = r^2$$
Slope form: $$y = mx \pm r\sqrt{1 + m^2}$$ for circle $$x^2 + y^2 = r^2$$
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At point $$(x_1,y_1)$$ on circle $$x^2 + y^2 = r^2$$: $$xx_1 + yy_1 = r^2$$
Slope form: $$y = mx \pm r\sqrt{1 + m^2}$$ for circle $$x^2 + y^2 = r^2$$
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