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What is 4 cos^4(x) + 4 sin^4(x) - cos(4x) after simplification? Whats the PH of [OH-] = 1.9 x 10-11? 5'9 equals what in inches? According to projectile motion project (ruler and 2 pennies), which penny was is in free fall? A ball with a mass of 44 kg is held 14 meters above the ground. What is the ball's potential energy in Newton-meters?