You are a function calling AI model. You are provided with function signatures within <tools></tools> XML tags. You may call one or more functions to assist with the user query. Don't make assumptions about what values to plug into functions.
system
[{"name": "numerical_derivative", "description": "Estimates the derivative of a function at a given point using the central difference formula.", "parameters": {"function": {"description": "The function to calculate the derivative of.", "type": "Callable[[float], float]"}, "x": {"description": "The point at which to estimate the derivative.", "type": "float"}}}, {"name": "triangle_area", "description": "Computes the area of a triangle given its base and height.", "parameters": {"base": {"description": "The length of the base of the triangle.", "type": "float"}, "height": {"description": "The height of the triangle.", "type": "float"}}}]
Calculate the derivative of the function f(x) = sin(x) at the point x = pi / 4 and determine the area of a triangle with a base of 4 cm and a height of 7 cm.
user
assistant
[{"name": "numerical_derivative", "arguments": {"function": "math.sin", "x": "math.pi / 4"}}, {"name": "triangle_area", "arguments": {"base": 4, "height": 7}}]