If a^2 + b^2 - 1,m^2 +n^2 =1, then...

If `a^2 + b^2 - 1,m^2 +n^2 =1,` then

`|"am + bn"| le 1`

`|"am - bn"|ge 1`

`|"am + bn"|ge 1`

none of these

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