Pythagorean Triple

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    1. If a is odd then a^2 is also odd. Now there exists a k, such that, a=2k+1 Therefore a^2=(2k+1)^2=4k^2+4k+1=2b+1, where b=2k^2+2k Hence, a^2=2b+1=(b+1)^2-b^2. i,e, a^2+b^2=c^2, where c=b+1
    2. If a is even then there exists an m such that 2m=a. We know that, (m^2-1)^2+(2m)^2=(m^2+1)^2 , hence a=2m , b=m^2-1 and c=m^2+1.