Find dy for the follow function by using implicit differentiation. dx a. x(x + y) = y(3x - y) b. e cos x 1 + sin(xy) = 2. Please calculate the first and second derivative of the expression below. x + xy + y = 1 3. Please find the equation of the line tangent to the curve tan(x + y) + sec(x y) = 2 at the point 1). Please use the unit circle when it's values are valid. Please express answers in exact values, meaning use fractions rather than decimals.