Q. 204.0( 9 Votes )

Evaluate the foll

Answer :

We will use basic formula : (a + b)2 = a2 + b2 + 2ab


Or, a2 + b2 = (a + b)2 -2ab


Here,


=


Applying above formula, we get,

x4 + 1 = (x2 + 1)2 - 2 × 1 × x2


=


Hence, =


Separate the numerator terms,



=

{ add and subtract 2 to the second term)


=

{ }


=


=

{ since }


=

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