Express cos* + in terms of cosines and sines of multiples of t.

/in /by

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Hi, how can find a and b and c in this question? Is there any formula for expanding cos^n(x) and sin^n(x)?

Express cos* + in terms of cosines and sines of multiples of t.cost _ a cos bit + bcos It + coos 2+ + TO5where a –

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