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Sqrt{3^x}+sqrt{3^{-x}}=10? When the time is between 5 and 6 o'clock, what is the exact time at which the minute hand is directly over the hour hand? 1/NR=LIMPV/P-0? How to make assumptions and derive momentum shell balance for a newtonian fluid flow through an equilateral triangle duct over length L? How do you simplify 4cos(x)sin(x)tan(x)?