The fundamental equation for correct steering is (where φ and α = 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)

A. sinφ + sinα = b/c

B. cosφ - sinα = c/b

C. cotφ - cotα = c/b

D. tanφ + cotα = b/c

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