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This question is from edexcel IAL paper c34 no.13 13. A curve C has parametric equations: . . . . .x\, =\, 6\, \cos(2t),\, y\, =\, 2\, \sin(t),\, -\dfrac{\pi}{2}\, <\, t\, <\, \dfrac{\pi}{2} (a) Show that \, \dfrac{dy}{dx}\, =\, \lambda\, \csc(t),\, giving the exact value of the constant \...