The Instant Tangent – math.stackexchange.com

The Instant Tangent – math.stackexchange.com

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It is interesting to note that the tangent at point $(p,q)$ for the circle $(x-h)^2+(y-k)^2=r^2$ is $$(x-h)(p-h)+(y-k)(q-k)=r^2$$ which is formulated simply by replacing one component of the squared ...

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