# data[].attributes.body
The product of three functions

If f, g, h are differentiable at x then so is fgh and:

( fgh )’=f’gh+fg’h+fgh’

# data[].attributes.body
To find the equation of the tangent line at the point P(a, f(a)):

1. Find derivative function f’(x)

2. Find the slope of the tangent line using: m=f’(a)

3. Use the slope-point formula to get the equation of the tangent line: y-f(a)=m(x-a)