Answer Posted / mahadev pawase

As it has 2 inputs & 1 output & o/p is wrt 2-i/ps,now a
block with minimum(sufficient) area producing 1-o/p
corresponding to 2 i/ps must be triangle with o/p at its
vertex .It shows above picture with area as triange.
It is the standard symbol for OPAMP IC and it is used all
over the world.

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