 Hi, and welcome to our section. Let us discuss the following question. The question says, if x is equal to a into 1 plus t square upon 1 minus t square, and y is equal to 2t by 1 minus t square, find dy by dx. With this solution, we are given that x is equal to a into 1 plus t square by 1 minus t square, and y is equal to 2t by 1 minus t square. Now, dy by dx is equal to dy by differentiating this equation into derivative of 1 plus t square e square into derivative of minus t square divided by minus t square whole square. t square is 2t 2 minus 2t square.