The fundamental equation for correct steering is (where $$\varphi $$ and $$\alpha $$ = Angle through which the axis of the outer wheel and inner wheel turns respectively, c = Distance between the pivots of the front axles and d = Wheel base)?

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  1. $$\sin \varphi + \sin \alpha = \frac{{\text{b}}}{{\text{c}}}$$
  2. $$\cos \varphi - \sin \alpha = \frac{{\text{c}}}{{\text{b}}}$$
  3. $$\cot \varphi - \cot \alpha = \frac{{\text{c}}}{{\text{b}}}$$
  4. $$\tan \varphi + \cot \alpha = \frac{{\text{b}}}{{\text{c}}}$$

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Answer: Option 3

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