dw Use the Chain Rule to find it . where w = cos 12x sin 3y, x = -, and y =13. . . . ax (Type an expression using x and y as the variables.) dx dt (Type an expression using t as the variable.) aw dy (Type an expression using x and y as the variables.) dy dt (Type an expression using t as the variable.) dw dt (Type an expression using t as the variable.)