- Tanx/2 = cosx - cos2x / sinx +sin2x I got up to tan but i can't figure out how to get tan?

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How could you prove that electrons are fundamental particles present in every substance? HELP HOW TO WRITE THIS AS A SINGLE LOGARITHM???? Balance the following equation: -CH4+-O2 -> -CO2+-H2O? If you started with 15 moles of CH4, to start with, how many moles of H2O would be produced? Usingbalanced equation CH4+ 2O2 -> CO2+ 2H2O? Show that: a) W = {(x1, x2, x3) ∈ R^3: x1=x3} is a vector subspace of R^3. b) Do (1,3,1) and (2,5,2) form a basis of W? Explain answer.?