these are the formulas:
sin(3x) = 3sin(x) - 4*sin(x)^3
cos(3x) = 4cos(x)^3 - 3cos(x)
tan(3x) = (3tan(x) - tan(x)^3) / (1-3tan(x)^2)
2007-02-26 22:10:40 · 3 answers · asked by allyson 1 in Education & Reference ➔ Homework Help
pls tell me the step by step procedure on how it was derived....tnx
2007-02-26 22:24:16 · update #1
...this is a part of my report in our trigonometry class...plz i really need your help....tnx a lot....
2007-02-28 23:19:21 · update #2
Do the research yourself. Anything worth having is worth working for.
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2007-03-06 21:00:59 · answer #1 · answered by seattleogre 3 · 0⤊ 0⤋
They were derived from all possible right triangles. It is not necessary to have even or whole number angles, and these formulas provide for those that do not fall in to the whole number form.
2007-02-27 06:16:37 · answer #2 · answered by threegreenballz 2 · 0⤊ 0⤋
it is based on double angle formula
sin (2x + x)
cos (2x + x)
tan (2x + x)
2007-02-27 06:20:38 · answer #3 · answered by Chris L 2 · 0⤊ 0⤋