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Trig Solving
Step Nine

Mathematics & Statistic Tutor Perth - SPSS Help   

Step Nine

Whichever method you use, you still want the solution of  x not some multiple of x, in this question it is  3x, as the question was Sin (3x). 
Remember in Step Three,  the graph of the trig function was extended to
when using Wave Distance and CAST Diagram, the final step is to divide each answer by the number we multiplied by in Step Three, for this question divide by 3.

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