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Question: How to plot the tangent line of a equation given an x value?

Question:How to plot the tangent line of a equation given an x value?

mathnoob1 10
tangent plotting
July 18 2015
1

Hi, I am stumped I've tried many ways but end up getting a graph with nothing on it or errors. I am trying to plot the tangent line to the equation f(x) = 2cosx-x^2 at x = 2; In addition, how would I plot the tangent line and the equation on one graph with distinctive line pattern for example, one being blue and dotted, while the other being red solid).

 

Thanks in advance!
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