Let P be the circular function that sends a real number 0 to the point (cos 0, sin 0). Which of the following ideas is useful in deriving the value of P The points (0, 0), P() and P (-) form an equilateral triangle. If P()= (, y), then y = -1. The points (0, 0), (1,0) and P () form an equilateral triangle. If P(E) = (x, y), then 2 = y, and y > 0. %3D

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