How to find the angle according to the triangle function? It's not 30.45.60 For example, Sina = 0.33/1.6, what is the angle? How to find it?

If a is between (0180), a = 11.9 degrees or 168.1 degrees; if there is no such limit, a = 2 * n * 180 + 11.9 or 2 * n * 180 + 168.1, where n is an integer

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