a+(a^-1) = √3 হলে, a²+(a^-2) এর মান-

A 3

B 2

C 1

D 0

Solution

Correct Answer: Option C

   a+a^-1 = √3 

    a+1/a = √3 

 এখন, a^2 + a^-2 = a^2 + 1/a^2 

                 = (a)^2 + (1/a)^2 

                = (a+1/a)^2 - 2.a.1/a 

               = (√3)^2 - 2 

               = 3 - 2 = 1 

          a^2 + a^-2 = 1 

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