- List multiples to find the lcm of 15 and 18?

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What information do u need to prove common law marriage in Rhode Island? Tan2x=2tanx/1+tan^2x... my math teacher gave me this but I thought the double-angle identity was with a denominator 1-tan^2x? Was there any flaws in Einstein general relativity theory? Does dE/dt mean delta E over delta t? Sometimes i realized dE means an infinitesimal of something rather than a change in that quantity? In the future will trains transform into planes?