f'(x)= cos(9x)-9xsin9x
f'(0)=1
f''(x)= -18sin9x-81xsin(9x)
f''(0)=0
f'''(x)=729xsin(9x)-243cos(9x)
f"'(0)=-243
f''''(x)=6561xcos(9x)+2916sin(9x)
f''''(0)=0
McLauren series is given by
So answer is

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