2.1-2.5 quiz Flashcards
sin x ‘
cos x
cos x’
-sin x
tan x’
sec^2 x
cot x
-csc^2 x
sec x’
sec x(tan x)
csc x’
-csc x(cot x)
product rule
h(x) = f(x)(g(x))
h’(x) = f x g’ + g x f’
quotient rule
h(x) = f(x)/g(x)
h’(x) = g x f’ - f x g’ / g^2
chain rule
h(x) = f(g(x))
think like peeling an onion
h’(x) = f’(g(x)) x g’(x)
sin 2x
2sinxcosx
consider the curve : formula
show that dy/dx equals formula
basically dy/dx is the formula of the curve
what is differentiation
where the slope equals the tangent line
the process of finding a derivative is called
differentiation
what does differentiability imply
continuity
the derivative doesn’t exist at
discontinuities
cusps
when the tangent becomes vertical(straight up and down line part)
power rule
d/dx[x^n] =
nx^n-1
power rule on constants
d/dx 5
0
find equation of tangent line to graph of f(x) at the point(x,y)
how to solve
find derivative of f(x) to solve for the slope at any point on the function
then plug in (x,y) to find the slope for that particular point
implicit differentiation procedure
differentiate each term with respect to x (dy/dx)
nivel all terms contains dy/dx to the left side of the equation and all other terms to the right side
factor out dy/dx on left side of equation
solve for dy/dx
product vs chain tule for trig functions:
if the angle theta is just x it is product rule; if it is 2x however or (2x-1) whether it has parentheses or not it is chain rule
what happens to the “y” with implicit differentiation
it becomes dy/dx
with respect to x
what happens to x in implicit differentiation
nothing with respect to x becomes 1 so the x is left alone
L’hospitsl rule
How to wrote AP TESTA ND FRQ
1) show f(x) and g(x) are continuos and differentiable
(Write f(x) and g(x) separately!)
2) show lim f(x) = 0 and lim g(x) = 0
x->a x-> a
3) using L’Hospitals rule
lim f(x)/ g(x) = lim f’(x)/g’(x) plug in number
x->a x-> a
L’hospital rule idea
If in indeterminate form find derivative of og equation and replug in pts, if still indeterminate keep finding derivatives