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Solve 4 sin(20) + 7 sin(a) = 0 for all solutions 0 Solve 4 sin(2a) + 7 sin(a) 0 for all solutions 0 < a

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Solve 4 sin(20) + 7 sin(a) = 0 for all solutions 0

Solve 4 sin(2a) + 7 sin(a) 0 for all solutions 0 < a < Yr. Give your answers accurate to at least 2 decimal places and in a list separated by commas.

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