- If 0 <= u <= pi/2 and x=sec u, then sqrt(x^2 - 1) = f(u), where f(u) equals?

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A = { primes > 0 } B = { factors of 245 } C = { natural numbers ≥ 3 } A ∩ B ∩ C = ? How are sensory neurons, inter neurons, and motor neurons involved in a reflex pathway? Calculate the pH of a 0.0471 M aqueous solution of diethylamine ((C2H5)2NH, Kb = 6.9×10-4).? How do humans grow from single cells into newborns? What causes the movement of electromagnetic radiation?