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One of the roots of the equation `8x^(3)-6x+1=0` isA. `cos 10^(@)`B. `cos 80^(@)`C. `cos 30^(@)`D. `sin 30^(@)` |
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Answer» Correct Answer - 2 `4x^(3)-3x=-(1)/(2)` `implies sin 3theta=sin 30^(@),x=sin theta` `implies theta =10^(@)` i.e. `sin 10^(@)` is a root i.e ` cos 80^(@)` is a root |
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