a-1/a= 5√3 হলে a2+1/a2= কত ?
Solution
Correct Answer: Option C
a-1/a= 5√3
বা, (a-1/a)2=(5√3)2
বা, a2+1/a2-2(a*1/a)=25*3
বা,a2+1/a2-2=75
বা, a2+1/a2=75+2
অতএব, a2+1/a2=77
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