You may think you have the topic of limits covered… But can you handle trigonometric limits? In this pencast I find the limit of a trigonometric function. You may think that they are periodic, and therefore don’t have any limit value? Not necessarily…
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Finding the limit of a trig function is an interesting concept and the more I attempt doing this, the more I come to the conclusion that if you're going to memorize anything, it should be trig functions – you never get away from them!
This pencast is simple and easy to follow and gives a great example where knowing additional information is required.