husseine57
Newbie level 2
What is the Fourier series of the function f(x)=cos (a sin(x))?
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\[\cos(a \sin{x}) = J_0(a) + 2 \displaystyle\sum_{k=1}^{\infty} J_k(a)\cos(kx)\]
\[J_k(x)\] is the Bessel function
Thanks.
What about these functions:
sin(a cos(x))
sin(a sin(x))
cos(a cos(x))