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Cos^2 x+2cosx+1=0? Derivation of propositional logic for (p ∨ (q ⊃ q))? Which method is more accurate to determine the magnification of an image di/do or hi/ho? What is 4 cos^4(x) + 4 sin^4(x) - cos(4x) after simplification? A weight with a mass of 284 g is dropped 2 meters. What is the weight's velocity right before impact?