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Based in the Seattle Area.

Free study guides and discussions about various topics in Mathematics. Thanks for stopping by!

My Math Teacher is Terrible! (I can help.)

Nov 3
Nov 3 An interesting Mean Value Theorem question about a piecewise function

Phil Petrocelli

This is a really interesting question from the front lines of AP Calculus AB.

Oct 31
Oct 31 Calculus thinking: Seeing and applying a cool algebra trick!

Phil Petrocelli

This is an interesting derivatives question that can be dealt with more easily if we employ a somewhat advanced, possibly non-obvious algebra trick.

Sep 30
Sep 30 A very good statistics discussion (The Atlantic, COVID)

Phil Petrocelli

Measures of center is a key topic in Statistics. Here, The Atlantic discusses it in reference to COVID and COVID data.

Sep 22
Sep 22 An interesting conic sections (parabola) problem

Phil Petrocelli

Conic sections problems can be tricky for many reasons. In this problem, we are only given some points and the parabola’s orientation, and we are asked to find the equation of the parabola in vertex form. This article demonstrates two approaches to solving the problem.

May 21
May 21 A really interesting Calculus word problem: When should the Health Department start an aggressive vaccination program?

Phil Petrocelli

Viruses and vaccinations are on everyone’s minds these days, and calculus can help with some very
specific problems. How important is the Fundamental Theorem of Calculus? How important is knowing
how to use trigonometric identities? This article will answer those questions and more.

Apr 19
Apr 19 News about MyMathTeacherIsTerrible! Instagram! YouTube! Zoom sessions!

Phil Petrocelli

Many new things are happening here!

Mar 24
Mar 24 UPDATED: Three discussions about modeling the spread of COVID-19

Phil Petrocelli

Algebra2 and a year of Calculus are enough to follow most of what’s being said here. Super interesting.

Mar 2
Mar 2 A favorite Calculus resource: blackpenredpen!

Phil Petrocelli

Lots of good information is out there. Some people are really dedicated to their craft and to helping others. YouTube creator blackpenredpen is one such person.

Feb 26
Feb 26 L'Hôpital's Rule and Fundamental Theorem of Calculus (FTC) lurk!

Phil Petrocelli

Super interesting application of two useful techniques. Check this out!

Feb 24
Feb 24 Two ways to solve this (sort of) power-reduction Trig integral

Phil Petrocelli

Often, there are many ways to solve the same integration problem. This is an interesting one I saw on Reddit (r/Calculus) recently.

Feb 21
Feb 21 A tricky trigonometric integral with a surprising solution

Phil Petrocelli

This is one that shows that things play out in interesting ways, at times.

Feb 11
Feb 11 A challenging trig limit where L'Hôpital's Rule isn't so useful

Phil Petrocelli

When L'Hôpital's Rule isn't the savior that it usually is, slick algebra can help.

Feb 6
Feb 6 A L'Hôpital's Rule quickie!

Phil Petrocelli

Reddit (r/Calculus) provides, as does L’Hôpital’s Rule in the clutch!

Jan 31
Jan 31 A challenging L'Hôpital's Rule limit

Phil Petrocelli

Very interesting application of L'Hôpital's Rule, where we have a tough derivative that results in easing the situation.

Jan 24
Jan 24 A tough limit problem, two ways

Phil Petrocelli

This is one where we just have to crank through the solution. Fortunately, we have two techniques from which to choose.

Jan 17
Jan 17 An interesting u-substitution with a slight twist

Phil Petrocelli

Sometimes a problem is just nonstandard enough…

Dec 21
Dec 21 Converting a repeating decimal to a fraction

Phil Petrocelli

Repeating decimals are rational numbers. Rational numbers can be expressed as ratios of integers. Let's look at some techniques for moving easily between repeating decimals and their ratio forms.

Dec 12
Dec 12 Using the fraction features of the TI-84 family of calculators

Phil Petrocelli

Once we acquire a skill and practice it, learning new skills sometimes begs a few shortcuts around skills
we’ve already mastered. In particular, working with fractions - fractions with numbers, as opposed
to variables - is one such area. The TI-84 family of calculators provides a few timesaving features for
working with fractions.

Nov 16
Nov 16 A curve sketching question that hits all the finer points

Phil Petrocelli

How do I know that I understand the finer points of curve sketching using Calculus I techniques? If you can handle this one, you’ve got it.

Oct 26
Oct 26 A great use of implicit differentiation: easy slopes of tangents

Phil Petrocelli

We know that implicit differentiation helps in many situations where we are not able to easily separate the dependent variable from the independent variable (single-variable Calculus). This example problem reminds us of why this is so useful.

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