The first part of this question was to find the roots of the equation 2x^3-5x^2-4x+3=0 i got x=-1, 3, and 1.(adsbygoogle = window.adsbygoogle || []).push({});

but then the second part completely confused me

b) Hence, by substituting x=cost solve the equation 2cos^3t-5cos^2t -4cost+3=0 for 0<t<2"pie", giving your answer in radians in terms of pie.

PLEASE HELP! :grumpy:

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# Triginometry - very annoying

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