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hahaha158
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Homework Statement
Find the degree 3 Taylor polynomial approximation to the function f(x)=5ln(sec(x)) about x=0.
Homework Equations
the taylor polynomial equation
The Attempt at a Solution
Here are my derivatives
f(x)=5ln(secx)
f'(x)=5tanx
f''(x)5sec^2(x)
f'''(x)=10sec^2(x)tanx
Please let me know if any of the above are wrong
When I try to plug in 0 for the x's above I end up with a whole lot of undefined answers because sec0=undefined. How can I get around this?
thanks