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# solve for 0<x<2pi watch

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1. i) 2 tan^3x - 7 tan^2x +7 tanx - 2 = 0
ii) 2 sin^3x - 7 sin^2x +7 sinx -2=0
iii) 2 cos^3x - 7 cos^2x +7 cosx -2 =0
2. (Original post by ramshahk)
i) 2 tan^3x - 7 tan^2x +7 tanx - 2 = 0
ii) 2 sin^3x - 7 sin^2x +7 sinx -2=0
iii) 2 cos^3x - 7 cos^2x +7 cosx -2 =0
They can all be factorised.
Notice that the expression can be factories using factor theorem.

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Updated: February 9, 2017
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