What is componendo and dividendo method? Plz explain.

**Componendo and dividendo** is a method of simplification in Mathematics.

According to it,

This proof is invalid for a=b and c=d because if such that *a* = *b* and *c = d*

then by application of componendo and dividendo, we get -

[as a=b and c=d]

Since division by zero is not defined. So, this proof is invalid for a = b and c = d

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