- 1/4 divided by 1/16?

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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? What is the magnitude of the potential difference
between two points that are 1.07 cm and
1.926 cm from a proton?
Answer in units of V.? Economists will always reach the same conclusion in their positive analyses.? Could someone please solve this physics problem? Using binomial expansion, evaluate (0.99)^6 to 3 decimal places. please show the full working.?