Question 1. Consider the function f(x, y) = x2 sin? y + 2 2 Define Python function gradf(x,y) which for each point (x,y) with x > 0 gives the gradient Vf(x, y) = (fx(x, y), fy(x, y)) as Python's tuple object. Use attribute pi from numpy for the value of n. So, if numpy is imported as np , use np.pi ## replace "raise NotImplementedError" by your code! # your code here """Check whether gradf is a function with a tuple output". assert callable(gradf) "Sorry, you need gradf defined as a function" assert isinstance(gradf (2, np.pi), tuple), "Sorry, your output is not a tuple." assert len(gradf (2, np.pi))==2 , "Sorry, the answer should be a tuple of length 2