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Question: Solving with trig identities

Question:Solving with trig identities

Vrbatim 118 Maple
solve trig
January 19 2015
1

There are two ways of expressing the solution to a cubic equation, one of them uses cos and arccos [1]. How do I / is there a way to ask Maple to get this form?

More generally, can Maple be instructucted to solve equations using trig identities?

[1] http://en.wikibooks.org/wiki/Trigonometry/The_solution_of_cubic_equations
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