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Janusz
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![Prove that |[a - b - c, 2a, 2a],[2b, b - c - a, 2b],[2c, 2c, c - a - b]| = (a + b +c)^3](http://i.ytimg.com/vi/F6Kll3fQIB0/mqdefault.jpg "Prove that |[a - b - c, 2a, 2a],[2b, b - c - a, 2b],[2c, 2c, c - a - b]| = (a + b +c)^3")
![[Chemistry] Show, by writing an appropriate series of equations, how you could prepare propyne from](http://i.ytimg.com/vi/2BNALdhyTlU/mqdefault.jpg "[Chemistry] Show, by writing an appropriate series of equations, how you could prepare propyne from")
