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Q4 increasing functions and product rule

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Q4 increasing functions and product rule

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(i) similar triangles
(ii) rate of change

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determining the coordinates and nature of the stationary point 

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q12 (product rule, eqn of tangent/normal, forming equation of line, decreasing function)

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q12 (product rule, eqn of tangent/normal, forming equation of line, decreasing function)

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I) Differentiation of exponential functions II) rate of change