Question 0802b

Maclaurin Series
Standard Series II

Question

Find the Maclaurin expansion of cos(3x+x2){\cos (3 x + x^2)} up to and including the term in x4.{x^4.} Express your answer in the form
1+ax2+bx3+cx4+1+ax^2+bx^3+cx^4 + \ldots

Attempt

a={a=}
b={b=}
c={c=}

Answer

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