Question: (a) Let a denote a real number, where 1 (b) After writing z = eiÎ¸ in the equation obtained in part (a), equate real parts

(a) Let a denote a real number, where ˆ’1

(b) After writing z = eiÎ¸ in the equation obtained in part (a), equate real parts and then imaginary parts on each side of the result to derive the summation formulas

where ˆ’1

a cos -a 1-2a cos asin 1-2a cos + a2 t-1

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