user: I need to calculate the derivative of the function \( f(x) = x^2 \) at the point where \( x = 5 \). Additionally, I'm looking to find out the area of a circle that has a radius of 10. Switching gears a bit, I'm also interested in the stock history of Apple, focusing on the monthly interval, and for this query, the diff and splits information isn't necessary. Finally, I'd like to get the latest numbers on the active COVID cases in the United States. Can you assist me with these calculations and data retrievals?

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.
x: type: integer
description: The point to calculate the derivative at.
required: function
x
name: geometry_area_circle
description: Calculates the area of a circle.
parameters: type: dict
properties: radius: type: integer
description: The radius of the circle, in feet.
required: radius
name: get_stock_history
description: Finds the price of a stock by its stock name.
parameters: type: dict
properties: stock_name: type: string
description: The stock name of the product, in the format of the stock symbol.
interval: type: string
description: The interval of the stock history. Allows one of following : 5m|15m|30m|1h|1d|1wk|1mo|3mo
diffandsplits: type: string
description: The diff and splits of the stock history. Allows one of following : true|false. Default to false
required: stock_name
interval
name: get_active_covid_case_by_country
description: Finds the most up to date active cases of a country result from COVID.
parameters: type: dict
properties: country: type: string
description: The country to find the active cases of, in the format of the country's full name.
required: country