I have gotten this answer wrong! Can anyone please help me to correct the errors please?

Entered Answer Preview Result Message 4*x*s*sin(y)+2*(x^2)"t*cos(y) 4rs sin(y) + 212t cos(y) correct 12*x*t*sin(y)+2*(x^2)"s*cos(y) 12xt sin(y) + 2x-s cos(y) correct -12*x*sin(y)+10*(x^2)*cos(y) -12x sin(y) + 10r? cos(y) Your answer isn't a number incorrect (it looks like a formula that returns a number) -60*x*sin(y)-6*(x^2)*cos(y) -60x sin(y) - 6x cos(y) Your answer isn't a number incorrect (it looks like a formula that returns a number) At least one of the answers above is NOT correct. Suppose z = r2 sin(y) , z = $2 + 3t2, y = 2st. A. Use the chain rule to find % and o as functions of I, y, s and t. Us 4xs sin (y) + 2x-t cos (y) 12xt sin (y ) + 2x's cos(y) B. Find the numerical values of oz and oz when (s, t) = (-3, 5) as (-3, 5) = -12x sin (y) + 10x cos (y) 92 ( -3, 5 ) = -60x sin (y) - 6x cos(y) Note: You can earn partial credit on this