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Is there a difference between a sinusoidal graph and a trigonometric graph? Is this a trigonometric graph, sinusoidal graph, or both? Which is a possible reason for the transition of algae from unicellularity to multicellularity ? Find the values of k for which the equation has two equal real solutions: x^2 + ( k - 1 )x + 1 *I got k= +/- 2* but that s wrong? Why do cheek cells contain more DNA than other parts of the body?