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A launch travels across a river from a p...

A launch travels across a river from a point `A` to a point `B` of the opposite bank along the line `AB` forming angle `prop` with the bank. The flag on the mast of the launch makes an angle `beta` with its direction of motion. Determine the speed of the launch w.r.t. the bank. The velocity of wind is `u` perpendicular to the stream.
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The correct Answer is:
`[u sin(alpha+beta - pi//2)sin beta]`
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