A polynomial composed of two monomials is called a binomial. How many terms will be the result of multiplication of two binomials? Write several such products and write the result

The multiplication of two binomials may be binomial, trinomial or tetranomial
For example:
（x-1）（x+1）=x²-1
（x-1）（x-1）=x²-2x+1
（x-a）（y+b）=xy+xb-ay-ab

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