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Two parallel towers A and B of different...

Two parallel towers `A` and `B` of different heights are at some distance on same level ground. If angle of elevation of a point `P` at `20 m` height on tower `B` from a point `Q` at `10 m` height on tower `A` is `theta` and is equal to half the-angle of elevation of point `R` at `50 m` height on `A` from point `P` on `B`, then sine of `theta` is

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