In: Math
1a) Find all first and second partial derivatives of f(x,y)=x^4−3x^2y^2+y^4
1b) w=xycosz, x=t, y=t^2, and z=t^3. Find dw/dt using the appropriate Chain Rule.
1c) Find equation of the tangent plane and find a set of parametric equations for the normal line to the surface z = ye^(2xy) at the point (0, 2, 2).