(adsbygoogle = window.adsbygoogle || []).push({}); infinity*0 = -1 ???

From Analitic Geometry;

Tan(x) = m

m1*m2 = -1

Tan(0) * Tan (90) = -1

Therefore;

0 * infinity = -1

What is wrong here?

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# Infinity*0 = -1 ?

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