code: def x_rotate(rotationAmt):
          
          ma4 = Matrix4((1, 0, 0, 0),
                        (0, math.cos(rotationAmt), -math.sin(rotationAmt), 0),
                        (0, math.sin(rotationAmt), math.cos(rotationAmt), 0),
                        (0, 0, 0, 1))
  
          return ma4
docs: Create a matrix that rotates around the x axis.