if a + 1/a =2;find
1. a^4+1/a^2
2.a^8+1/a^4
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Answer:
1.a+1=2a
a=1
a^4+1/a^2+1+1/1
=2/1
the answer is 2
2.a+1/a
a^2+1=2a
a^2=2a+1=0
a^2-a=a+1=0
a(a-1)-1(a-1)
a=1
a^8+1/a^4
=1+1/1
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