Convert exor gate to and gate?

A+b=

You can't make XOR out of NOT alone. Mathematically, NOT takes only a single argument, and its gate, an inverter, takes a single input. There's no way to combine two inputs giving a single output...

Invert the output of NAND.

xor and xnor gates are derived from not gate

Logic Gates are electronic building blocks of a digital system. They are realisations of the fundamental Boolean Algebraic Operations; AND, OR, NOT, XOR, NAND, NOR, XNOR, BUF.