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· th 1 14 IJSO 27 2557 10.10 - 11.40 u. 2/7 g = 9.8 ms 1.0 kcal = 4.2 kJ m 1. 2. a = logb b = 10a tan x = arctanx=y tany=x sin x = arcsin x cos x = arccosx
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