- Let S be a such that for each A, we have S subset A. Show that S equals an empty set.?

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What is cos-145^2+40^2-45^2/2*45*40? I try and enter it into my Calculator but it keeps saying error 2! My calculator is in degrees also!? Force applied to the end of a 5m vertl pole, roped to a horiztl 18m pole 50kg to just lift the 18m pole. Same pivot both poles? Where to find orris root? A > ~ ( Z v ~ Y )
Truth Value:? The main show tank has a radius of 60 feet and forms a quarter-sphere. What is the volume of the quarter-sphere shaped tank?

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