Use Python code: (A) Consider the function f(x) = x⁴ 3x³ Write a code that implements gradient descent to find the value of x where the function is minimum. Start at x = 1. (B) Repeat for the function f(x₁, x₂) = x₁³ 2x₁x₂ + x₂² Start with (x₁, x₂) = (1, 1).