user: While working on my physics assignment, I've been examining the motion of a particle on a linear trajectory. The equation f(x) = 3t^2 + 2t + 1 represents the particle's position over time. To grasp the particle's behavior better, I need to figure out its velocity at precisely 5 seconds. Could you help me calculate the derivative of the position function to find the velocity at that moment?

Available functions:
name: estimate_derivative
description: Estimate the derivative of a function at a given point.
parameters: type: dict
properties: function: type: string
description: The function to calculate the derivative of. This should be in the format of python lambda function.
x: type: integer
description: The point to calculate the derivative at.
required: function
x

Ground truth function call(s):
estimate_derivative(function='lambda x: 3*x**2 + 2*x + 1', x=5)