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A variable Delta ABC in the xy plane has...

A variable `Delta ABC` in the xy plane has its orthocentre at vertex B , a fixed vertex 'A' at the ongin and the third vertex restricted to lie on the parabola `y = 1+ (7x^2)/36` The point B starts at the point (0, 1) at time t=0 and moves upward along the y axis at a constant velocity of 2 cm/sec. How fast is the area of the triangle increasing when t=7/2 sec

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