- Help with precalc? reduce this equation cos^2(u)(1-tan^2(u))-2cos^2(u)?

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What makes Astronomy a science and Astrology not even close to being a science? Prove that the product of two consecutive multiples of 5 is always an even number? Can a physicist create his own computer, if he has mastered in Physics? I have a material with 2.6x10^13 electrons and 1.3x10^13 protons. what is the net charge of the material? The point A(-3,4) is reflected over the point (-5, 5) and it's image is point B. What are the coordinates of point B?