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I am not quite good at maths, so can you help me ?

$$\tan x + 2 \cot x - 3=0$$

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What exactly do you want? $\tan (x) + 2 \cot(x)-3$? And what do you want to solve for? – Stefan Feb 13 '13 at 12:31
up vote 3 down vote accepted

$$\tan{x}=\frac{1}{\cot{x}}.$$ $$\tan{x}+2 \cdot \frac{1}{\tan{x}}-3=0.$$ make a notation $t=\tan{x}. $

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Thank you very very much – Bee Feb 13 '13 at 12:34
@Bee: If this was sufficient to get you to a solution, you could accept the answer by clicking the check mark beside it. – Ross Millikan Feb 13 '13 at 12:37

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