The area of a trapezoid is given by A = (a + b) where h is the height and a and b are the lengths of the parallel sides. Find the following derivatives. Use da db dt' and instead of a'(t), b'(t), and h'(t) when needed. Do not simplify your answers. dt (a) If a and b are constant, find dA = dh dh dt (b) If h is constant, but a and b are changing with time, find dA dt (c) If b is constant, but h and a are changing with time, find dA dt

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