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1.1 Ll IV. Show that cos 56 = 160203 (9)5 20(cos 6)?' + 5 cos 6, and hence show that the roots of

\ 1.1 \ Ll IV. Show that cos 56 = 160203 (9)5 20(cos 6)?' + 5 cos 6, and hence show that the roots of n 31: 77! 97': x(16;7c4 20x2 + 5) = 0 are: O,cos,cos,cos,cos 10 10 10 10

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