- Why is Hertzsprung-Russel Diagram useful?

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Y= x^2/x-2
Study the continuity.
How di we do this? X should be different from 2. But then? We know that (-1)^n generates the sequence -1, 1, -1, 1, -1, ........ What formula generates -1, -1, 1, 1, -1, -1, 1, 1, ...........? Nuclei of atoms that make up a newborn baby were made? Aportaciones de newton sobre el movimiento de la tierra y el universo:? A bicyclist accelerates at a constant rate from a standstill to 15 km/hr in 90 sec?