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ตั้งแต่ 27 สิงหาคม 2026
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The Law of Sines

All of these trig functions come in real handy for finding the sides and angles of right triangles, but what about oblique triangles? If a triangle doesn't have a right angle, SOHCAHTOA doesn't apply. What do we do?! Don't worry, there are other ways to use these trig functions with oblique triangl…

ค้นหาตอนที่ผ่านมา

ค้นหาตอนที่ผ่านมาของ Professor Dave Explains

ตอนก่อนหน้านี้

Verifying Trigonometric Identities

Verifying trigonometric identities can be super fun! And also very frustrating when you can't figure them out. It can be tricky because there's no precise way to go about doing this, you have to just use your intuition, but let's go over some common strategies and identities that will more than lik…
Vocabulary is always fun! Today let's go over the parts of the body. You know, head and arms and stomach, that kind of stuff. That way if you get hurt in Italy, you'll know what to tell the doctor!Script by Patrizia Farina, Professor of Italian at Western Connecticut State University and Purchase C…
We've taken a look at many nouns from the first and second declensions. Now let's dive into the third declension, which is a bit trickier. This declension is divided into two subgroups: parasyllabic and imparisyllabic nouns. What do these terms mean? Let's dive into the imparisyllabic nouns first.S…

Inverse Trigonometric Functions

We know about inverse functions, and we know about trigonometric functions, so it's time to learn about inverse trigonometric functions! These are functions where you plug in valid values that trig functions can possess, and they spit out the angles that produce them. There's a little more to it th…
If you're going to interact with Italians, you definitely will have to be able to ask and answer the basic "What's up?" and "How's it going?" in order to get very far. Let's go over some of the basic ways we can ask and answer these questions, along with a little cultural context so that you don't …
Oh man, what is all this sine and cosine business? What do these things even mean?! And Greek letters now? I don't know Greek! OK friend, just relax. Understanding the trig functions is as easy as pi radians. We just make some triangles and set up a few definitions. I promise it's no sweat, just wa…
Alright, it's time to get into some more challenging math! Trigonometry is a subject that many people find intimidating, but once you understand some new ways to look at angles and some functions that pertain to them, it's really not so bad! First things first, let's make sure we understand what a …

Practice Problem: Pushing Boxes

Your friend Lisa needs some help moving, but how long will it take? You're so hungry! Just do a little work with kinematics and Newton's laws, and then it'll be time for tacos.Try all of the Classical Physics Practice Problems: http://bit.ly/ProfDaveCPPPClassical Physics Tutorials: http://bit.ly/Pr…
We hit most of the consonant sounds, but let's wrap things up by looking at the tricky letters S and Z, as well as the double consonants, which will help you sound very authentic!Script by Patrizia Farina, Professor of Italian at Western Connecticut State University and Purchase College.Watch the w…
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