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...C differentiation chain rule physicsandmathstutor com a find the value of dy at point where x on curve with equation dx y b differentiate sin respect to total marks tangent cos give your answer in form ax and are constants be found e ln heated metal ball is dropped into liquid as cools its temperature t minutes after it enters given by for which giving significant figures edexcel internal review rate decreasing instant when per minute d from terms above explain why can never fall q o p figure shows sketch part maximum show that lies coordinates area shaded region between line pq i sinx secx ii use derivatives cosec cot prove cosx iii tan iv...