Have you ever needed to know that one math formula that you always forget? Do you spend minutes flipping through your textbook or searching the internet for it? Then you need Formulus - Formulas for Calculus!
Formulus is the perfect study tool. It is a simple, easy to use, easy to navigate collection of the most important formulas and topics for high school and college students taking Calculus and Differential Equations.
Includes the following subject areas:
- Algebra & Geometry
- Partial Derivatives
- Series & Sequences
- Fixed formula sheet errors
- Reorganized formulas
Look out for more future enhancements!
Ratings and Reviews
Good calculus resource, could be better
I tutor calculus students for a living and this app is perfect for me - I know the material, I just can't remember all the formulas.
There is no interactivity. It's just a big PDF with a bunch of formulas and an occasional line of explanation. Beginners may frustrated in part because the organization is not great, but since it's free, you might as well have it.
The good news: there is a ton of stuff here, and it is all accurate as far as I can tell (exception: I can confirm an error in Simpson's rule that another reviewer pointed out). There is a sizable section on differential equations (including Laplace transforms), but not much on multivariable calculus.
Problem: there is a glitch with the headers. For example, when I was looking at derivatives, the header said "Algebra & Geometry."
The main complaint I have is that certain things have been overlooked. The derivative of an inverse function is missing. The section on complex numbers does not include Euler's formula. There's no mention of radius of convergence.
The list of power series expansions is too short - surely it should have cos(x), ln(x+1) and the binomial series. In the integration by parts section, why not include the tabular method? By and large, the list of integrals was shorter than I expected, but it does cover the basics.
It would be nice if this had a feature that allowed users to add their own notes (and corrections!).
But it's free, so you can't complain.
Great app, love it. FYI, there's a mistake in the power series expansion. For cos(x) you used cosh(x) which is not the same. The power series expansion for cos(x) is an alternating series, on the other hand, cosh(x) is the power series of cos(x) but you have to take the abs value of each term (not the same as abs val of the whole series). I just wanted to point out that typo.
It's a very good listing of useful formulas in high school/college math. I noticed two small errors (the abs(a)>=0, not just >0 and the change-of-base formula actually needs to CHANGE the base) and the formatting had a weird moment (why are the if...then statements for l'Hospital with two bullet points while all other conditions are in the same one?).
With Family Sharing set up, up to six family members can use this app.