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1. Motivation. There are several different motivations, let me give them here. Motivation One. We had a problem: find a parametric curve which describes the circle. This problem gave us the trigonometric functions as its solution. Suppose we had a … Continue reading
1. We will give (but not prove) Euler’s identity. From Euler’s equation we derive trigonometric functions. We postpone the proof for Euler’s equation until some future post, when we discuss Taylor series.