Video lesson for 3-1: http://got.im/Awh. We did not finish the last slide. Note that finding a "linear approximation" means to find the tangent line at the point specified and use it to approximate a height. For example, the linear approximation of y = sin(x) at x = 0 is y = x. We could use this line to approximate sin(x). For example, sin(0.2) is approximately 0.2.
Have a good weekend!
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