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Show : (x - 2cos20)(x + 2cos40)(x + 2cos80) = x³ - 3x - 1. ... ...?

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  • Show : (x - 2cos20)(x + 2cos40)(x + 2cos80) = x³ - 3x - 1. ... ...?


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(x^3+2x^2+3x-6)/(x-1) Please show how to do this Answer by Edwin McCravy(13244) ... 3x 6x Bring down the - 6 x² + 3x x - 1)x³ + 2x² + 3x
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Positive: 34 %
For some novices, seeing the graph of the product h(x) = (3x + 2)(2x+1) ... A zoom to the left shows. and to the right shows. The result seems on target.
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Positive: 31 %

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Solving cubics Nov 19, 2005 #1. hypermonkey2 ... Galois gives the problem X^3-3X+1. ... -2cos20, 2cos40, 2cos80. Last edited: Nov 22, ...
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Positive: 15 %
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