19、 已知,a=x+1/x,b=x-1/x,求2^(a^2)/2(b^2) 实际上知道a^2-b^2=4就行了,
答案16 a^2-b^2明明等于X分之4吗?
a^2-b^2明明等于X分之4吗?
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Please read JJ 19
goes like (x+1/x)(x+1x) - (x-1/x)(x-1/x) then do the whole muti .. you'll get 4 and 2^4 = 16.... that's the NONE NN way of doing it... so you can get the answer, just take a little time..
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