simplify 1/1+x^n+1/1+x^-n
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1/1+x^n+1/1+x^-n
=1+1+x^n+x^-n
=2+2x^n-n
=2+2x^0
=2+2
=4
.....may be !!
=1+1+x^n+x^-n
=2+2x^n-n
=2+2x^0
=2+2
=4
.....may be !!
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