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Show that none of the operations given below has identity.(i) `a ** b = a-b ` (ii) `a ** b = a^2 + b^2 ` (iii) `a ** b = a +ab ` (iv) ` a ** b = (a-b)^2 ` (v) ` a ** b = (ab)/4` (vi) ` a**b = a b^2`

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(i)Given `a ** b = a-b `
`e` is the identity of `**` if
`a**e=e**a=a`
i.e,. `a-e=e-a=a`
...
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