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The equation x^3-3/4x=-(sqrt(3))/8 is s...

The equation `x^3-3/4x=-(sqrt(3))/8` is satisfied by `x=cos((5pi)/(18))` (b) `x=cos((7pi)/(18))` `x=cos((23pi)/(18))` (d) `x=cos((17pi)/(18))`

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