(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Is there any direct formula for calculating the direct common tangent of two circles without having to go all the trouble of using y-y1=m(x1-x2) to derive it for two seperate tangents t1 and t2. If there is could anyone explain to me how it is derived???

2. Relevant equations

3. The attempt at a solution

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# Common tangent

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