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Show that (cosx-sinx) (cos2x+sinx) =cos2x? Qué significa soñar dos soles en el firmamento, uno plateado a la derecha y el otro dorado a la izquierda? Help! Is there a video classifier? Three cards are dealt. What is the probability that the last two are hearts.? How do you solve the x-value of f(x)=-x^2 +2x+3 by Quadratic function?