ABCD is the isosceles trapezoid with legs line AC and base line BC if the length of line AB is 7Y-4 the length of line BC is 4Y
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Answer:
Step-by-step explanation:
Normally, when I do this, I differentiate each term first with respect to x then with respect to y. In this solution, I differentiated the entire expression with respect to x, then with respect to y. That makes separating the dx and dy coefficients much easier, so the solution almost falls into your lap.