Question: 1. Solve the following problems by using a double-angle formula. Give your answers to two decimal places. /3 a) If sin 61/5 = -0.5878 and

1. Solve the following problems by using a double-angle formula. Give your answers to two decimal places. /3 a) If sin 61/5 = -0.5878 and cos 61/5 = -0.8090, then sin 121/5 =

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