[blueray]

I understand how to do the entire question apart from part v)

How do I answer part v)

Thanks

Question attached bellow

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Assuming that T is the point at which you want to find the tangent line, select a point P with the same x-coordinate as T, and with the same y-coordinate as the minimum point of the curve. Find the mid-point between the point P and the minimum point of the curve. You can label this M. Draw a line going through M and T: this is your tangent line.