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T F is a tower with F on the ground. ...

`T F` is a tower with `F` on the ground. The angle of elevation of `T` from `A` is `xo` such that `tanxo=2/5` and `A F=200 m` . The angle of elevation of `T` from a nearer point `B` is `yo` with `B F=80 m` . The value of `yo` is `75o` (b) `45o` (c) `60o` (d) `30o`

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