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(L) 290 bt SRS A न£ 108. a’-3a+1=0626R, 8 + व 6 शा |
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Answer» a^2-3a+1=0a^2+1=3a....(1)(a+1/a)^3=a^3+1/a^3+3a^2*1/a+3a*1/a^2a^3+1/a^^3=(a+1/a)^3-3(a+1/a)=1/a^3(a^2+1)^3-3/a(a^2+1)a^3+1/a^3=1/a^3(3a)^3-3/a(3a)=27-9=18 |
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