Q. 43.6( 16 Votes )

If = 4, find the value of

(i) , (ii) .

Answer :

(i)


Squaring both the sides,



Using the identity, (a – b)2 = a2 - 2ab + b2



-------------(1)


(ii) Squaring equation (1) using the identities, (a + b)2 = a2 + 2ab + b2




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