1.5. The resistance of a platinum wire is found to be 11.0002 at the ice point, 15.247 2 at the steam point, and 28.887 2 at the sulfur point. Find the constants a and b in the equation R' = R(1 + a® + bø³), and plot R' against Celsius temperature 0 in the range from 0 to 660°C.

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