- #1
seboastien
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Homework Statement
A question asks me to find the first three non-zero terms of ln(cosx)
Homework Equations
The Attempt at a Solution
I wrote cos x as 1+(1-cos x), used the power series of ln function, expanded cosx and simplified, here is my answer: 1/2x^2 - 1/6x^4 + 1/16x^6
Is that right?