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A boat took 2 hours to travel 24km down a river. And 3 hours to travel back upstream. Find the spread of the boat in still water at the speed of the current.
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Prove sin2a + cos2a - 1 / sin2a + cos2a + 1 = 1 - tana / 1 + cota
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A boat took 2 hours to travel 24km down a river. And 3 hours to travel back upstream. Find the sprea...
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