Limit sin(x)/x = 1 - MIT OpenCourseWare
θ→0(sin(θ)/θ) = 1. We switch from using x to using θ because we want to start thinking about the sine function as describing a ratio of sides in the triangle shown in Figure 1. The variable we’re interested in is an angle, not a horizontal position, so we discuss sin(θ)/θ rather than sin(x)/x. 1 ˜ arc length sin˜ ................
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